The key arteries supplying the visual pathway include the internal carotid artery, posterior cerebral artery, anterior cerebral artery, ophthalmic artery, and posterior ciliary arteries. The central retinal artery supplies the retina. The optic nerve receives blood supply from the posterior ciliary arteries and branches of the ophthalmic artery. The optic chiasm, tract, lateral geniculate body, and visual cortex are supplied by branches of the internal carotid, anterior cerebral, and posterior cerebral arteries. Venous drainage is primarily through the central retinal vein, ophthalmic veins, basal veins and internal cerebral veins.
a comprehensive presentation on Slit-lamp in which i have described about the history, optics and also the uses of different illuminations by Dr. Paresh Nichlani
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anatomy of optic nerve and its blood supply and clinical corelation
Presentation Layout: optic nerve anatomy
Embryology of optic nerve
Introduction
Parts of optic nerve
Blood supply
Clinical significance
For Further Reading
Wolff’s Anatomy of the eye and orbit by Bron, Tripathi and Tripathi
Anatomy and Physiology of eye by A.K. Khurana 2nd edition
Comprehensive Ophthalmology by A.K. Khurana 5th edition
AAO- Fundamentals & Principles of Ophthalmology : sec 2
Walsh and Hoyt’s Clinical Ophthalmology
Internet
a comprehensive presentation on Slit-lamp in which i have described about the history, optics and also the uses of different illuminations by Dr. Paresh Nichlani
Direct Download Link ❤❤https://healthkura.com/eye-ppt/28/❤❤
Dear viewers Check Out my other piece of works at ❤❤❤ https://healthkura.com/eye-ppt/❤❤❤
anatomy of optic nerve and its blood supply and clinical corelation
Presentation Layout: optic nerve anatomy
Embryology of optic nerve
Introduction
Parts of optic nerve
Blood supply
Clinical significance
For Further Reading
Wolff’s Anatomy of the eye and orbit by Bron, Tripathi and Tripathi
Anatomy and Physiology of eye by A.K. Khurana 2nd edition
Comprehensive Ophthalmology by A.K. Khurana 5th edition
AAO- Fundamentals & Principles of Ophthalmology : sec 2
Walsh and Hoyt’s Clinical Ophthalmology
Internet
Clinical syndromes of vascular disease of the nervousaditya romadhon
The middle cerebral artery is the largest branch of the internal carotid artery and supllies the largest area of the cerebral cortex
Supplying the motor and sensory cortices, also supplies the areas of the cortex pertaining to the comprehension Wernicke’s area and expresion brocca’s area (left hemisphere)
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.
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
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
Title: Sense of Taste
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 structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
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Knee anatomy and clinical tests 2024.pdfvimalpl1234
This includes all relevant anatomy and clinical tests compiled from standard textbooks, Campbell,netter etc..It is comprehensive and best suited for orthopaedicians and orthopaedic residents.
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
Ozempic: Preoperative Management of Patients on GLP-1 Receptor Agonists Saeid Safari
Preoperative Management of Patients on GLP-1 Receptor Agonists like Ozempic and Semiglutide
ASA GUIDELINE
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Lung Cancer: Artificial Intelligence, Synergetics, Complex System Analysis, S...Oleg Kshivets
RESULTS: Overall life span (LS) was 2252.1±1742.5 days and cumulative 5-year survival (5YS) reached 73.2%, 10 years – 64.8%, 20 years – 42.5%. 513 LCP lived more than 5 years (LS=3124.6±1525.6 days), 148 LCP – more than 10 years (LS=5054.4±1504.1 days).199 LCP died because of LC (LS=562.7±374.5 days). 5YS of LCP after bi/lobectomies was significantly superior in comparison with LCP after pneumonectomies (78.1% vs.63.7%, P=0.00001 by log-rank test). AT significantly improved 5YS (66.3% vs. 34.8%) (P=0.00000 by log-rank test) only for LCP with N1-2. Cox modeling displayed that 5YS of LCP significantly depended on: phase transition (PT) early-invasive LC in terms of synergetics, PT N0—N12, cell ratio factors (ratio between cancer cells- CC and blood cells subpopulations), G1-3, histology, glucose, AT, blood cell circuit, prothrombin index, heparin tolerance, recalcification time (P=0.000-0.038). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and PT early-invasive LC (rank=1), PT N0—N12 (rank=2), thrombocytes/CC (3), erythrocytes/CC (4), eosinophils/CC (5), healthy cells/CC (6), lymphocytes/CC (7), segmented neutrophils/CC (8), stick neutrophils/CC (9), monocytes/CC (10); leucocytes/CC (11). Correct prediction of 5YS was 100% by neural networks computing (area under ROC curve=1.0; error=0.0).
CONCLUSIONS: 5YS of LCP after radical procedures significantly depended on: 1) PT early-invasive cancer; 2) PT N0--N12; 3) cell ratio factors; 4) blood cell circuit; 5) biochemical factors; 6) hemostasis system; 7) AT; 8) LC characteristics; 9) LC cell dynamics; 10) surgery type: lobectomy/pneumonectomy; 11) anthropometric data. Optimal diagnosis and treatment strategies for LC are: 1) screening and early detection of LC; 2) availability of experienced thoracic surgeons because of complexity of radical procedures; 3) aggressive en block surgery and adequate lymph node dissection for completeness; 4) precise prediction; 5) adjuvant chemoimmunoradiotherapy for LCP with unfavorable prognosis.
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
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Report Back from SGO 2024: What’s the Latest in Cervical Cancer?bkling
Are you curious about what’s new in cervical cancer research or unsure what the findings mean? Join Dr. Emily Ko, a gynecologic oncologist at Penn Medicine, to learn about the latest updates from the Society of Gynecologic Oncology (SGO) 2024 Annual Meeting on Women’s Cancer. Dr. Ko will discuss what the research presented at the conference means for you and answer your questions about the new developments.
Triangles of Neck and Clinical Correlation by Dr. RIG.pptx
BLOOD SUPPLY OF VISUAL PATHWAY
1. D R . P R A T E E K V I S H W A K A R M A
D N B O P H T H A L M O L O G Y
BLOOD SUPPLY OF VISUAL
PATHWAY
2. Introduction
Arteries of Brain :
Circle of willis
Circle of willis :
Lies in interpeduncular fossa
at the base of brain.
Encircles the pituitary stalk
provides important
communications between the
blood supply of the forebrain
and hindbrain
3. Formed by:
Anterior communicating art
Ant cerebral art
Post communicating art
Post cerebral art
Basilar art
Basically a free anastomosis
bertween 2 ICA and 2 VA
4. Vertebral Artery
Enter post cranial fossa
through foramen magnum
Ascends upward, forward
and medially on
medulla oblongata
unite at lower border
of pons to form
BASILAR Artery.
5. Br. Of Cranial part of Vertebral artery:
1. Meningeal br
2. Post spinal art
3. Ant Spinal art
4. Post inferior cerebellar
art
5. Medullary art
6. Basilar Artery
Ascends in groove on anterior surface of pons and at
upper border divides into two PCA.
Br. Of Basilar art:
1. Ant Inf cerebellar art
2. Sup cerebellar art
3. Labyrinthine art
4. Pontine art
5. Posterior Cerebral Art:
7. Posterior Cerebral Art
1.visual cortex
2.posteromedial aspect of LGB
3.post region of optic radiation
Calcarine artery: whole of
Visual cortex and posterior
portion of Optic Radiations
Posterior choroidal artery:
post medial aspect of LGB
Posterior choroidal artery
9. Internal carotid artery
Enters middle cranial fossa through carotid canal
Passes through foramen lacerum
Runs in cavernous sinus
Emerge from anterior part of its
roof
Lies lateral to OC
10. Cerebral Part:
(Mn: CAMP Off)
Ophthalmic art
Choridal art:
chaisma,
optic tract (post aspect),
LGB (ant and lateral aspect) and
commencement of optic radiations.
11. Ant Cerebral:
upper aspect of chiasma,
intra cranial part of optic nerve.
Middle Cerebral: largest branch
superolateral aspect of cerebrum,
inferolateral aspect of chiasma,
optic radiation,
small part of visual cortex
Post Communicating Art: joins Post Cerebral art to form
part of C.O.W.
12. Ophthalmic Artery
Br of ICA (after it leaves the roof of cavernous sinus)
At origin: inf to ON
Pass through the Optic
canal within dural sheath
of ON
13. At the apex of Orbit: lateral to ON and medial to occulomotor and
abducent nerve and
14. Runs forward and upwards
over Optic nerve ,below
Superior rectus and then comes
to lie medial to ON
Ends by dividing into:
dorsal nasal art
supra trochleaar art
The ophthalmic artery and its
branches are tortuous to
accommodate for the
movements of the eyeball.
15. Branches of Ophthalmic Artery:
1. Central retinal art
2. Long and Short posterior Ciliary art
3. Muscular art: Ant ciliary art
4. Lacrimal art: Lateral palpebral art
5. Medial palpebral art
6. Supra orbital art
7. Anterior ethmoidal art
8. Posterior ethmoidal art
9. Recurrent meningeal art
10. Dorsal nasal art (terminal br.)
11. Supra trochlear art(terminal br.)
16. Long and Short Posterior Ciliary Artery
Two long post ciliary art : arise from ophthalmic art below ON
10-20 Short ciliary arteries: forms part of choroidal circulation
18. Blood Supply Of Retina
Outer four layers: Choriocapillaris
Inner six layers: Central retinal artery
Outer plexiform layer: Watershed area
It gets blood supply from both,
the central retinal artery
and choriocapillaris.
20. In the optic nerve head:
Superficial in the nasal part of
the cup
Covered by a thin layer of glial tissue
(meniscus of Kuhnt, which separates
the vessels from the vitreous)
Divides into superior and
inferior branches
at disc margin: sup and inf br. Divide into nasal and temporal br.
21. In the retina: The four terminal branches divide
dichotomously and end without anastomosis
22. One of the capillary plexuses is
in the superficial zone
(nerve fibre layer)and the other
one is at the junction of
inner nuclear and outer plexiform
layer.
23. Macula
Superior and inferior temporal branches of central retinal
artery
Cilioretinal artery:
It is seen in some individuals.
It is a branch of ciliary system of vessels.
Supplies macula
It helps to retain the central vision
in the event of CRAO.
Fovea: Avascular area (500 µm)
Mainly supplied by choriocapillaris
24. CRAO
Nearly always at the lamina cribrosa
Generally, due to an embolus, there may be
associated arteriosclerosis, hypertension or
Buerger disease
Sudden and complete blindness, opaque and milky
white retina, cherry red reflex at the fovea
25.
26. Venous drainage of retina
Central retinal vein and its branches follows same
pattern as CRA
Empties into sup and inf ophthalmic veins
Which drains into Cavernous sinus
27. CRVO
Presentation : sudden, u/l blurred vision.
Fundus: tortuosity and dilatation of all branches
with Dot/blot and flame shaped
hemorrhages in all 4 quad most
numerous at periphery
cotton wool spots ,
macular edema
28. Blood Supply Of The Optic Nerve
Differ significantly depending upon which segment is
considered
Intraocular
Intraorbital
Intracanalicular
Intracranial
31. AION
Defect in the blood supply of anterior part of the
optic nerve by posterior ciliary artery - AION
It produces a postlaminar infarct.
Can be inflammatory (arteritic) or Non-
inflammatory (non arteritic)
32. Intraorbital
Intraorbital optic nerve is 3cm
long while the entry of the
central retinal artery is
5-15.5mm behind the globe.
So, the optic nerve here, is
divided into two segments,
proximal and distal.
Distal segment:
Axial supply, in addition
Proximal segment:
Centripetal branches of pial network
formed from br. Of PCAs
33. Periaxial system of vessels:
1. Ophthalmic artery
2. Long posterior ciliary arteries
3. Short posterior ciliary arteries
4. Lacrimal artery
5. Central retinal artery
6. Circle of Zinn
Axial system of vessels:
1. Intraneural branches of central retinal artery
2. Central collateral arteries from central retinal artery
34. PION
Disorders affecting small pial vessels supplying the
intraorbital part of the optic nerve
Vision loss with afferent pupillary defect.
No visible ophthalmoscopic abnormality
It can occur in disorders with vasculitis and
conditions producing acute systemic hypotension.
35. Intracanalicular
Lies in a watershed zone
Anteriorly from collateral br of Ophthalmic art
Posteriorly from pial vessels from
-ICA and
-Superior hypophyseal arteries.
As opposed to Intraorbital part of ON, which moves
freely as the eye moves, the intra canalicular part is
tightly fixed to optic canal, making it vulnerable to
shearing injury in # skull
36. Intracranial
Exclusively supplied by the periaxial system of
vessels
Pial plexus:
1. Direct branches of internal carotid artery OR
Recurrent branch of anterior superior hypophyseal artery:
They supply to the inferior aspect of the optic nerve.
2. Branches from anterior cerebral artery:
They supply to the superior aspect of the optic nerve
3. Recurrent branches from the ophthalmic artery
4. Twigs from the anterior communicating artery
37. Venous drainage of optic nerve
central retinal vein (primarily) and
pial plexus of veins
ophthalmic vein.
The intracranial part is drained by anterior
cerebral and basal veins.
38. Optic chiasma
Mainly derieved from br of Ant cerebral and Internal
carotid art.
Superiorly: Anterior cerebral and anterior communicating
arteries
Inferiorly: Internal carotid artery, anterior superior
hypophyseal artery and posterior communicating artery
A branch of the ophthalmic artery supplies the antero-
inferior margin of the chiasma.
43. Occlusion of Anterior choroidal artery produces
produces an upper- and lower-sector field defect.
44. Occlusion of Posterior choroidal art produces a
homonymous horizontal sectoranopia
45. Optic radiations
Anterior
part of optic
radiations
Middle part
of optic
radiation
Perforati
ng br. Of
MCA
Posterior
part of optic
radiations
Venous
drainage:
Basal vein
and middle
cerebral
vein
46. Visual cortex
calcarine branches of PCA
Anterior end of the calcarine sulcus: Middle cerebral artery
At the occipital pole of the cortex, there is an anastomosis between
posterior and middle cerebral arteries. Therefore, in thrombosis of
posterior cerebral artery, macula is spared.
Internal occipital vein › Great cerebral vein of Galen & straight sinus
Inferior cerebral vein › Cavernous sinus