The document outlines various objectives and components of the respiratory system, including the anatomy and functions of the nasal cavity, paranasal sinuses, pharynx, larynx, and lungs. It describes the transport of gases through the respiratory system and various respiratory disorders. The respiratory system works to oxygenate the blood and remove carbon dioxide through a series of upper and lower respiratory tract structures and gas exchange processes.
BRAINSTEM
The Brainstem lies at the base of the brain and the top of the spinal cord.
The brainstem is located in the posterior cranial fossa.
The brainstem is the structure that connects the cerebrum of the brain to the spinal cord and cerebellum.
Provides a pathway for tracts running between higher and lower neural centers.
Divided into 3 major divisions:
midbrain,
pons, and
medulla oblongata.
It is responsible for many vital functions of life, such as breathing, consciousness, blood pressure, heart rate, and sleep.
It contains many critical collections of white and grey matter.
The grey matter within the brainstem consists of nerve cell bodies and form many important brainstem nuclei. Ten of the twelve cranial nerves arise from their cranial nerve nuclei in the brainstem.
The white matter tracts of the brainstem include axons of nerves traversing their course to different structures. These tracts travel both to the brain (afferent) and from the brain (efferent) such as the somatosensory pathways and the corticospinal tracts, respectively.
Mid Brain
The midbrain is continuous with the cerebral hemisphere.
The upper posterior (i.e. rear) portion of the midbrain is called the tectum, which means "roof."
The surface of the tectum is covered with four bumps representing two paired structures: the superior and inferior colliculi.
The superior colliculi are involved in eye movements and visual processing, while the inferior colliculi are involved in auditory processing.
Another important nucleus, the substantia nigra, is located here.
The substantia nigra is rich in dopamine neurons and is considered part of the basal ganglia.
Pons
An important pathway for tracts that run from the cerebrum down to the medulla and spinal cord, as well as for tracts that travel up into the brain.
It also forms important connections with the cerebellum via fibre bundles known as the cerebellar peduncles.
Posteriorly, the pons and medulla are separated from the cerebellum by the fourth ventricle.
Home to several nuclei for cranial nerves.
Medulla
The point where the brainstem connects to the spinal cord.
Contains a nucleus called the nucleus of the solitary tract that is crucial for our survival (receives information about blood flow, along with information about levels of oxygen and carbon dioxide in the blood, from the heart and major blood vessels).
When this information suggests a discordance with bodily needs (e.g. blood pressure is too low), there are reflexive actions initiated in the nucleus of the solitary tract to bring things back to within the desired range.
Blood Supply
The brain stem receives its blood supply exclusively from the posterior circulation, including the vertebrae and basilar artery.
The medulla receives its blood supply from the vertebral via medial and lateral perforating arteries.
The pons and midbrain receive their blood from the basilar via the medial and lateral perforating arteries.
Introduction to respiration and mechanics of ventilation (the guyton and hall...Maryam Fida
Respiration is the process by which oxygen is taken in and carbon dioxide is given out.
Respiration is classified into two types:
1. External respiration
It involves exchange of respiratory gases, i.e. oxygen and carbon dioxide between lungs and blood.
2. Internal respiration
It involves exchange of gases between blood and tissues.
Respiration occurs in two phases:
Inspiration during which air enters the lungs from atmosphere.
2. Expiration during which air leaves the lungs.
During normal breathing, inspiration is an active
process and expiration is a passive process.
Respiratory tract is divided into two parts:
1. Upper respiratory tract that includes all the
structures from nose up to vocal cords; vocal cords are the folds of mucous membrane within larynx that vibrates to produce the voice
2. Lower respiratory tract, which includes Larynx, trachea, bronchi and lungs.
RESPIRATORY UNIT
Respiratory unit is defined as:
“The structural and functional unit of lung”. Exchange of gases occurs only in this part of the respiratory tract.
STRUCTURE OF RESPIRATORY UNIT
1. Respiratory bronchioles
2. Alveolar ducts
3. Alveolar sacs
4. Antrum
5. Alveoli
Between the trachea and alveoli airways divide 23 times
Out of 23 divisions first 16 are just to conduct air and these divisions of airways are up to terminal bronchioles.
The last 7 divisions are for the exchange of gases and these divisions which are for exchange of gases includes respiratory bronchioles, alveolar ducts and alveoli.
There are 300 million alveoli in the lungs and the alveolar surface form s an area of 70-100 square meters
This PPT covers Anatomy and Physiology of respiratory system. Anatomy of respiratory organs, Mechanism of respiration, Internal Respiration, external respiration, Transport of oxygen in blood, Transport of carbon dioxide in blood, Regulation of respiration, lung volume and lung capacities are explained.
BRAINSTEM
The Brainstem lies at the base of the brain and the top of the spinal cord.
The brainstem is located in the posterior cranial fossa.
The brainstem is the structure that connects the cerebrum of the brain to the spinal cord and cerebellum.
Provides a pathway for tracts running between higher and lower neural centers.
Divided into 3 major divisions:
midbrain,
pons, and
medulla oblongata.
It is responsible for many vital functions of life, such as breathing, consciousness, blood pressure, heart rate, and sleep.
It contains many critical collections of white and grey matter.
The grey matter within the brainstem consists of nerve cell bodies and form many important brainstem nuclei. Ten of the twelve cranial nerves arise from their cranial nerve nuclei in the brainstem.
The white matter tracts of the brainstem include axons of nerves traversing their course to different structures. These tracts travel both to the brain (afferent) and from the brain (efferent) such as the somatosensory pathways and the corticospinal tracts, respectively.
Mid Brain
The midbrain is continuous with the cerebral hemisphere.
The upper posterior (i.e. rear) portion of the midbrain is called the tectum, which means "roof."
The surface of the tectum is covered with four bumps representing two paired structures: the superior and inferior colliculi.
The superior colliculi are involved in eye movements and visual processing, while the inferior colliculi are involved in auditory processing.
Another important nucleus, the substantia nigra, is located here.
The substantia nigra is rich in dopamine neurons and is considered part of the basal ganglia.
Pons
An important pathway for tracts that run from the cerebrum down to the medulla and spinal cord, as well as for tracts that travel up into the brain.
It also forms important connections with the cerebellum via fibre bundles known as the cerebellar peduncles.
Posteriorly, the pons and medulla are separated from the cerebellum by the fourth ventricle.
Home to several nuclei for cranial nerves.
Medulla
The point where the brainstem connects to the spinal cord.
Contains a nucleus called the nucleus of the solitary tract that is crucial for our survival (receives information about blood flow, along with information about levels of oxygen and carbon dioxide in the blood, from the heart and major blood vessels).
When this information suggests a discordance with bodily needs (e.g. blood pressure is too low), there are reflexive actions initiated in the nucleus of the solitary tract to bring things back to within the desired range.
Blood Supply
The brain stem receives its blood supply exclusively from the posterior circulation, including the vertebrae and basilar artery.
The medulla receives its blood supply from the vertebral via medial and lateral perforating arteries.
The pons and midbrain receive their blood from the basilar via the medial and lateral perforating arteries.
Introduction to respiration and mechanics of ventilation (the guyton and hall...Maryam Fida
Respiration is the process by which oxygen is taken in and carbon dioxide is given out.
Respiration is classified into two types:
1. External respiration
It involves exchange of respiratory gases, i.e. oxygen and carbon dioxide between lungs and blood.
2. Internal respiration
It involves exchange of gases between blood and tissues.
Respiration occurs in two phases:
Inspiration during which air enters the lungs from atmosphere.
2. Expiration during which air leaves the lungs.
During normal breathing, inspiration is an active
process and expiration is a passive process.
Respiratory tract is divided into two parts:
1. Upper respiratory tract that includes all the
structures from nose up to vocal cords; vocal cords are the folds of mucous membrane within larynx that vibrates to produce the voice
2. Lower respiratory tract, which includes Larynx, trachea, bronchi and lungs.
RESPIRATORY UNIT
Respiratory unit is defined as:
“The structural and functional unit of lung”. Exchange of gases occurs only in this part of the respiratory tract.
STRUCTURE OF RESPIRATORY UNIT
1. Respiratory bronchioles
2. Alveolar ducts
3. Alveolar sacs
4. Antrum
5. Alveoli
Between the trachea and alveoli airways divide 23 times
Out of 23 divisions first 16 are just to conduct air and these divisions of airways are up to terminal bronchioles.
The last 7 divisions are for the exchange of gases and these divisions which are for exchange of gases includes respiratory bronchioles, alveolar ducts and alveoli.
There are 300 million alveoli in the lungs and the alveolar surface form s an area of 70-100 square meters
This PPT covers Anatomy and Physiology of respiratory system. Anatomy of respiratory organs, Mechanism of respiration, Internal Respiration, external respiration, Transport of oxygen in blood, Transport of carbon dioxide in blood, Regulation of respiration, lung volume and lung capacities are explained.
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
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Muktapishti is a traditional Ayurvedic preparation made from Shoditha Mukta (Purified Pearl), is believed to help regulate thyroid function and reduce symptoms of hyperthyroidism due to its cooling and balancing properties. Clinical evidence on its efficacy remains limited, necessitating further research to validate its therapeutic benefits.
Best Ayurvedic medicine for Gas and IndigestionSwastikAyurveda
Here is the updated list of Top Best Ayurvedic medicine for Gas and Indigestion and those are Gas-O-Go Syp for Dyspepsia | Lavizyme Syrup for Acidity | Yumzyme Hepatoprotective Capsules etc
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
Ozempic: Preoperative Management of Patients on GLP-1 Receptor Agonists Saeid Safari
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ASA GUIDELINE
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CDSCO and Phamacovigilance {Regulatory body in India}NEHA GUPTA
The Central Drugs Standard Control Organization (CDSCO) is India's national regulatory body for pharmaceuticals and medical devices. Operating under the Directorate General of Health Services, Ministry of Health & Family Welfare, Government of India, the CDSCO is responsible for approving new drugs, conducting clinical trials, setting standards for drugs, controlling the quality of imported drugs, and coordinating the activities of State Drug Control Organizations by providing expert advice.
Pharmacovigilance, on the other hand, is the science and activities related to the detection, assessment, understanding, and prevention of adverse effects or any other drug-related problems. The primary aim of pharmacovigilance is to ensure the safety and efficacy of medicines, thereby protecting public health.
In India, pharmacovigilance activities are monitored by the Pharmacovigilance Programme of India (PvPI), which works closely with CDSCO to collect, analyze, and act upon data regarding adverse drug reactions (ADRs). Together, they play a critical role in ensuring that the benefits of drugs outweigh their risks, maintaining high standards of patient safety, and promoting the rational use of medicines.
Local Advanced Lung Cancer: Artificial Intelligence, Synergetics, Complex Sys...Oleg Kshivets
Overall life span (LS) was 1671.7±1721.6 days and cumulative 5YS reached 62.4%, 10 years – 50.4%, 20 years – 44.6%. 94 LCP lived more than 5 years without cancer (LS=2958.6±1723.6 days), 22 – more than 10 years (LS=5571±1841.8 days). 67 LCP died because of LC (LS=471.9±344 days). AT significantly improved 5YS (68% vs. 53.7%) (P=0.028 by log-rank test). Cox modeling displayed that 5YS of LCP significantly depended on: N0-N12, T3-4, blood cell circuit, cell ratio factors (ratio between cancer cells-CC and blood cells subpopulations), LC cell dynamics, recalcification time, heparin tolerance, prothrombin index, protein, AT, procedure type (P=0.000-0.031). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and N0-12 (rank=1), thrombocytes/CC (rank=2), segmented neutrophils/CC (3), eosinophils/CC (4), erythrocytes/CC (5), healthy cells/CC (6), lymphocytes/CC (7), stick neutrophils/CC (8), leucocytes/CC (9), monocytes/CC (10). Correct prediction of 5YS was 100% by neural networks computing (error=0.000; area under ROC curve=1.0).
Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
Adv. biopharm. APPLICATION OF PHARMACOKINETICS : TARGETED DRUG DELIVERY SYSTEMSAkankshaAshtankar
MIP 201T & MPH 202T
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APPLICATION OF PHARMACOKINETICS : TARGETED DRUG DELIVERY SYSTEMS By - AKANKSHA ASHTANKAR
NVBDCP.pptx Nation vector borne disease control programSapna Thakur
NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
2. Objectives
Functional anatomy of respiratory system
Mechanics of breathing
Transport of gases
Regulation of respiration
Pulmonary circulation
Lung function tests
Hypoxia and others conditions
Effect of high barometric pressure
Common disorders of respiratory system
3. Oxygen Cell
Hi I am O2 ,you can call
me oxygen, and I will be your guide today.
I advise you keep all feet
and hands inside the ride at all times.
JH
4. Respiratory Intro
You may be asking, what is the Respiratory
system?
Well, the Respiratory system is the system
that helps you breath in and out, so oxygen
(02) can be pumped through your body and
carbon dioxide (CO2) can be removed from
the blood stream.
You must remember that the Respiratory
system is made up of many different organs.
5. Anatomy of respiratory system
• The organs of respiratory system include:
– Nose
– Nasal cavity
– Paranasal sinuses
– Pharynx
– Larynx
– Trachea
– Bronchi and there small bronches
– Lungs which contain alveoli
7. Anatomy of Respiratory System
• Structural classification
– Upper respiratory tract
– Lower respiratory tract
• Functional classification
Conducting portion (nose, pharynx, larynx, trachea,
bronchi, bronchioles, and terminal bronchioles
Their function is to filter, warm, and moisten air and conduct
it into the lungs
Provides rigid conduits for air to reach the sites of gas
exchange.
• Respiratory muscles – diaphragm and other muscles that
promote ventilation
9. The Respiratory System
• Function of Respiratory system
To provide oxygen (O2) to and eliminate carbon
dioxide (CO2) from the cells of the body.
Filters, warm and moisten the inspired air
Produces sound
Contains receptors for smell
Rids the body of some excess water and heat
Helps regulate blood pH
10. The Respiratory System
Functions to supply the body with O2 and remove CO2
“Respiration” is actually 4 distinct processes:
1. Ventilation – Movement of air into & out of the lungs
2. External Respiration – Gas exchange between blood
and air-filled chambers of the lungs
3. Transport of Gases
4. Internal Respiration – Gas exchange between
systemic blood and the tissue cells
15. Nasal Passage
Bronchi Tubes
Alveoli (air-sacs)
Thin-walled blood vessels called
capillaries
Very thin cells line
the alveoli so that
O2 and CO2 can
pass in and out of
Bronchioles pass
air to and from
your alveoli.
The Trachea
is held open
by partial
rings of
cartilage.
Tongue
Pharynx
Where
are We?
We are here.
16. The Nose
• Only externally visible part of the respiratory
system.
• Functions include:
• Providing an airway for respiration
• Moistening and warming air
• Filtering inspired air
• Serving as a resonating center for speech
• Housing the olfactory receptors.
18. The Nose
Cartilages:
Septal cartilage
Nasal cartilage
Alar cartilage(lower
nasal cartilage)
A few minor alar
cartilage
Fibro-fatty tissue in
the lower part of ala
19. 19
Nasal Cavity
• Lies in and posterior to the external nose
• Is divided by a midline nasal septum
• Opens posteriorly into the nasal pharynx via
internal nares
• The ethmoid and sphenoid bones form the
roof
• The floor is formed by the hard and soft
palates
24. The Medial Wall of Nasal Cavity
The Nasal Septum Divides the
nasal cavity into right and left
halves
It has osseous and
Cartilaginous parts
Nasal septum consists of the
Perpendicular plate of the
ethmoid bone (superior)
The vomer (inferior)
and Septial cartilage (anterior)
Perpendicular
Plate (ethmoid)
Septal
Cartilage Vomer
25. Blood Supply:
External Nose:
Dorsal nasal artery
Angular artery
Superior labial artery
Internal Nose:
Sphenopalatine artery from
maxillary A.
B. Ant. & Post ethmoidal A.
from ophthalmic a.
C. Branches of facial A.
Sphenopalatine a.
Maxillary a.
Veins
Ethmoidal vein------Ophthalmic v.
Other branches---- Pterygoid venous plexus
Facial vein
26. NERVE SUPPLY
Olfactory nerve
Anterior ethmoidal nerve
Nasal branches of pterigo
palatine ganglion
Nasopalatine nerve
External nose –Infra orbital nerve, Infra trochlear,
External nasal nerve.
Nerve Supply of the Nasal Cavity
27. The Nasal Cavity
• Olfactory region of nasal cavity
Olfactory region (Upper 1/3 rd) –The roof of the nasal
cavity, the superior aspect of the nasal septum, and the
superior concha has olfactory epithelium and olfactory
glands.
mucous membrane lined by pseudostratified columnar
epithelium - more delicate and yellowish.
The olfactory epithelium is composed of three types of
cells:
Olfactory cells
Sustentacular cells
Basal cells.
Lamina propria, houses of Bowman’s glands and a rich
vascular plexus.
29. MUCOUS MEMBRANE
Lower 2/3 rd – Respiratory region, Lined by pseudo stratified
ciliated columnar epithelium-Thick ,spongy ,highly vascular
with numerous mucous glands contain Goblet cells.
Goblet cells-function produces mucus
– Contains lysozyme.
– Traps inspired dust, bacteria, and debris.
High H2O content of mucus humidifies inward air
Ciliary current moves mucus to pharynx for swallowing.
Cold temperature disable these cilia runny nose
Contains Arteriovenous anastomosis –warms the air passing through it.
Mucous membrane covering vestibule of nose carries stiff hairs (Vibrissae).
30. This is where it all begins.
This is where the oxygen first
enters your body and also where
Carbon Dioxide leaves.
The Nose and Mouth
MB
31. The Nose and Mouth
When the air comes into your nose it gets
filtered by tiny hairs and it is moistened by the
mucus that is in your nose.
Your sinuses also help out with your
Respiratory System.
They help to moisten
and heat the air that you breath.
Air can also get into your body through your
mouth/oral cavity but air is not filtered as
much when it enters in through your mouth.
MB
32. The Paranasal Sinuses
• Paranasal Sinuses
– Cavities in cranial bones
• Functions
– Lighten skull bones
– Produce mucus
– Resonate during sound
production
– help warm and moisten air
Each sinus is name after the bone it resides in!
34. Maxillary Sinus
Pyramidal in shape
Paired & symmetric
Located within the body of the
maxilla behind the skin of the
cheek.
The roof is formed by the floor
of the orbit, and the floor is
related to the roots of the 2nd
premolars and 1st molar teeth.
The maxillary sinus opens into
the middle meatus of the nose
Capacity of 30ml.
35. Frontal Sinuses
Rarely symmetrical
Contained within the frontal
bone .
Separated from each other by
a bony septum.
Each sinus is roughly triangular
Extending upward above the
medial end of the eyebrow and
backward into the medial part
of the roof of the orbit.
Opens into the middle meatus
36. Sphenoidal Sinuses
• Lie within the body of the
sphenoid bone
• Below sella turcica
– Extends between dorsum
sellae and post clinoid
processes
• Opens into the
sphenoethmoidal recess
above the superior
concha
37. Ethmoid Sinuses
• They are anterior, middle, and
posterior
• They are contained within the
ethmoid bone, between the nose
and the orbit
• Anterior & middle
– Drains into middle nasal meatus
• Posterior
– Drain into superior nasal meatus
• Separated from the orbit by a
thin plate of bone so that
infection can readily spread from
the sinuses into the orbit
38. The Pharynx
Funnel-shaped passageway that connects nasal
cavity and mouth to the larynx and esophagus.
The muscular wall consists of skeletal muscle.
Extends from base of the
skull to the level of 6th
cervical vertebrae.
39. The Pharynx
The nasopharynx – air passage
– Lined by respiratory epithelium
• (pseudostratified Ciliated columnar
epithelium)
– Pharyngeal tonsil
– Auditory tube
Oral and laryngeal region
– Passageway for air, food,
and drink
– Stratified squamous epith.
40.
41. Nasopharynx
• Boundaries:
• Roof: body of sphenoid &
basal part of the occipital
bone
• Floor: upper surface of soft
palate and pharyngeal
isthmus
42. Oropharynx
• Lies behind the mouth
• Extends from soft palate to
upper border of epiglottis
• Boundaries:
• Roof: Soft palate and
pharyngeal isthmus
• Floor: Posterior one third of
tongue, median & lateral
glossoepiglottic folds
43. Laryngopharynx
Lies behind the laryngeal inlet & the
posterior surface of larynx
Extends from upper border of
epiglottis to lower border of cricoid
cartilage
Boundaries:
Anterior wall: mucosa surface of the
posterior surface of larynx
• Posterior wall: supported by bodies of
C3, 4, 5, 6 vertebrae
• Lateral wall:
Supported by thyroid cartilage and
thyrohyoid membrane
44. Pharyngeal Wall
It is a musculo-membranous
wall, composed of:
Mucosa & submucosa
Pharyngobasilar fascia
Muscles: circular &
longitudinal
Buccopharyngeal fascia
45. Nerve supply of the pharynx
Motor supply
Cranial part of accessory nerve
Glossopharyngeal nerve.
Recurrent laryngeal nerve
External laryngeal nerve.
Sensory supply
Pharyngeal branch of pterygo-palatine ganglion.
Glossopharyngeal nerve.
Internal laryngeal nerve.
46. Blood supply of the pharynx
a) Ascending pharyngeal artery
b) Facial artery
c) Maxillary artery.
d) Lingual artery
47. 47
The Larynx (Voicebox)
Extends from the level of the 4th to the 6th cervical
vertebrae
Attaches to hyoid bone superiorly
Inferiorly is continuous with trachea (windpipe)
Three functions:
1. Produces vocalizations (speech)
2. Provides an open airway (breathing)
3. Switching mechanism to route air and food into proper
channels
• Closed during swallowing
• Open during breathing
48. 48
• Framework of the larynx
9 Cartilages connected by membranes and ligaments
Thyroid cartilage with laryngeal prominence (Adam’s apple)
anteriorly
Cricoid cartilage inferior to thyroid cartilage: the only
complete ring of cartilage: signet shaped and wide
posteriorly
49. 49
Behind thyroid cartilage and above cricoid: 3
pairs of small cartilages
1. Arytenoid: anchor the vocal cords
2. Corniculate
3. Cuneiform
– 9th cartilage: epiglottis
50. 50
Epliglottis* (the 9th cartilage)
Elastic cartilage covered by mucosa .On a stalk attached to thyroid cartilage
Attaches to back of tongue
During swallowing, larynx is pulled superiorly Epiglottis tips inferiorly to cover
and seal laryngeal inlet to Keeps food out of lower respiratory tract
53. The laryngeal muscles are a set of muscles in the anterior neck responsible
for sound production. The intrinsic muscles of the larynx function to move the
vocal cartilages and control tension. They are innervated by the Vagus nerve.
54.
55. 55
• Pair of mucosal vocal folds (true vocal cords)
over the ligaments: white because avascular
56. 56
• Innervation of larynx (makes surgery at neck risky)
– Recurrent laryngeal nerves
– Vagus nerve
– Damage to one: Hoarseness
– Damage to both: can only Whisper
58. The Larynx
Histology Structures
Epithelial lining:
Superior portion of larynx is lined by stratified squamous
epithelium
Below the vocal folds – pseudostratified ciliated columnar
epithelium.
59. Pitch
• The faster the vocal folds vibrate, the higher the pitch.
• In general, men's vocal folds can vibrate from 90 - 500
Hz, and they average about 115 Hz in conversation.
• Women's vocal folds can vibrate from 150 -1000 Hz,
and they average about 200 Hz in conversation.
• Vocal folds vibrate faster as they're pulled longer,
thinner, and more taut and vibrate more slowly when
they're shorter, thicker, and floppier.
• The cricothyroid muscle and thyroarytenoid muscle
coordinate with each other to create different pitches
60. Cough Reflex
• Cough ejects mucus and foreign matter
from the lungs and helps maintain
patency of the pulmonary alveoli. May
be voluntary, but more often in
response to stimulation of receptors in
the larynx or lower respiratory tract.
• Three phases:
inspiratory- larynx opens wide to
permit rapid and deep inspiration;
compressive- tight closure of the
glottis and strong activation of
expiratory muscles;
expulsive- larynx opens widely and
a sudden outflow of air in the range
of 6-10 liters/sec.