The digestive system breaks down food into smaller molecules that can be absorbed by cells. It consists of the alimentary canal (mouth to anus) and accessory glands. The alimentary canal wall has four layers - mucosa, submucosa, muscular layer, and serosa. Muscles in the walls provide segmentation to mix foods and peristalsis to propel foods through the canal. Accessory glands like the salivary glands secrete chemicals to aid digestion. The mouth is the beginning of the alimentary canal and contains the teeth, tongue, and palate to mechanically break down foods. Saliva from the parotid, submandibular, and sublingual
Study of the structure/form of the human body. Study location of organs, reasons for location, and shape. Anatomy is the science which deals with the description of the structure of cells, tissues, organs and organisms.
Study of the structure/form of the human body. Study location of organs, reasons for location, and shape. Anatomy is the science which deals with the description of the structure of cells, tissues, organs and organisms.
these slides are prepared to understand digestive system IN EASY WAY
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FIRST AID- https://www.youtube.com/playlist?list=PL93S13oM2gAMvGqeqH2ZTklzFAZhOrvgP
HCM- https://www.youtube.com/playlist?list=PL93S13oM2gAM7mZ1vZhQBHWbdLnLb-cH9
FUNDAMENTALS OF NURSING- https://www.youtube.com/playlist?list=PL93S13oM2gAPFxu78NDLpGPaxEmK1fTao
COMMUNICABLE DISEASES- https://www.youtube.com/playlist?list=PL93S13oM2gAOWo4IwNjLU_LCuhRN0ZLeb
ENVIRONMENTAL HEALTH- https://www.youtube.com/playlist?list=PL93S13oM2gAPkI6LvfS8Zu1nm6mZi9FK6
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study of structures and functions of the gastrointestinal tract
- histology of the oral cavity
- histology of the pharynx
- histology of the esophagus and stomach
- histology of intestine
- histology of the liver and pancreas
Introduction to digestive system
Organs of digestive tract
Mouth and their different enzymes and actions
salivary glands
Oesophagus
Stomach
Small Intestine and funcions
Large Intestine and functions
Anus
Assessary Organs
Liver
Pancreas
Digestive system Physiology
Ingestion
Digestion
Absorption
Assimilation.
Excretion
1st Semester Anatomy - Digestive System - GIT - By thirumurugan.pptxthiru murugan
Digestive System:
Also known as gastrointestinal tract, digestive tract, digestional tract, GI tract, GIT, gut, or alimentary canal.
Consist of alimentary tract and Accessory organs
It involve in Ingestion, Digestion, Absorption and Excretion
It is started from mouth and ended at anal canal, that is assisted and supported by many parts.
Parts of Digestive System: Primary digestive organs & Accessory organs
Primary digestive organs: Mouth, Pharynx, Esophagus, Stomach, Small Intestine, Large Intestine, Rectum, Anal canal
Accessory organs: Teeth, Tongue, Salivary glands, Liver, Gallbladder, Pancreas.
Mouth
First part of GIT, Also known as oral or buccal cavity, It consist of muscles & bones
Tongue or Lingua:Voluntary muscular structure, Occupies floor of mouth
Superior surface consist of numerous papillae contains taste bud for the sense of taste. Attached inferiorly with hyoid bone, Highly mobile muscular part of GIT.
Teeth: Teeth are the hard and whitish substances present in the mouth Which is essential for chewing & speech. They fixed in socket of alveolar ridge in mandible & maxilla (Jaw). Diphyodont is a type of dentition in which two successive sets of teeth are developed during the lifetime. The first set of teeth is temporary or deciduous or milk and the other set is permanent teeth
Salivary glands: These are exocrine glands found in oral cavity that secrete complex fluid known as saliva
Types: Major & Minor salivary glands
Major salivary gland: Parotid, Submandibular & Sublingual
Minor salivary glands: There are 450 minor salivary glands present in oral cavity, lips, cheeks, palate and floor of the mouth
Pharynx: Wide, muscular tube situated behind the nose, mouth & larynx
Cavity of pharynx divided into nasopharynx, oropharynx and laryngopharynx.
Esophagus: The esophagus is a fibromuscular tube, approximately 25cm in length,
It transports food from the pharynx to the stomach.
Stomach: The stomach is a hollow organ in the GIT.
It is the “J” shaped dilated part, situated in the upper part of the abdomen.
Gross Anatomy of stomach: The stomach has four main anatomical divisions; the cardia, fundus, body and pylorus:
Cardia: surrounds the superior opening of the stomach. it consist cardiac sphincter
Fundus: the rounded, often gas filled portion superior to and left of the cardia.
Body: the large central portion inferior to the fundus.
Pylorus: This area connects the stomach to the duodenum. It is divided into the pyloric antrum, pyloric canal and pyloric sphincter.
Pancreas: The pancreas is a soft, finely lobulated, elongated dual (Exo Endocrine) gland.
Liver: It is the largest gland of the body. It involve metabolic activities
The liver is one of the vital organs of the body, responsible for chemical actions that the body needs to survive.
Small intestine: The intestine which is the longest part of the digestive tube is divided into small intestine and large intestine.
Large Intestine or Colon: It is a last part of the GIT
these slides are prepared to understand digestive system IN EASY WAY
Important links- NOTES- https://mynursingstudents.blogspot.com/
youtube channel
https://www.youtube.com/c/MYSTUDENTSU...
CHANEL PLAYLIST-
ANATOMY AND PHYSIOLOGY-https://www.youtube.com/playlist?list=PL93S13oM2gAPM3VTGVUXIeswKJ3XGaD2p
COMMUNITY HEALTH NURSING- https://www.youtube.com/playlist?list=PL93S13oM2gAPyslPNdIJoVjiXEDTVEDzs
CHILD HEALTH NURSING- https://www.youtube.com/playlist?list=PL93S13oM2gANcslmv0DXg6BWmWN359Gvg
FIRST AID- https://www.youtube.com/playlist?list=PL93S13oM2gAMvGqeqH2ZTklzFAZhOrvgP
HCM- https://www.youtube.com/playlist?list=PL93S13oM2gAM7mZ1vZhQBHWbdLnLb-cH9
FUNDAMENTALS OF NURSING- https://www.youtube.com/playlist?list=PL93S13oM2gAPFxu78NDLpGPaxEmK1fTao
COMMUNICABLE DISEASES- https://www.youtube.com/playlist?list=PL93S13oM2gAOWo4IwNjLU_LCuhRN0ZLeb
ENVIRONMENTAL HEALTH- https://www.youtube.com/playlist?list=PL93S13oM2gAPkI6LvfS8Zu1nm6mZi9FK6
MSN- https://www.youtube.com/playlist?list=PL93S13oM2gAOdyoHnDLAoR_o8M6ccqYBm
HINDI ONLY- https://www.youtube.com/playlist?list=PL93S13oM2gAN4L-FJ3s_IEXgZCijGUA1A
ENGLISH ONLY- https://www.youtube.com/playlist?list=PL93S13oM2gAMYv2a1hFcq4W1nBjTnRkHP
facebook profile- https://www.facebook.com/suresh.kr.lrhs/
FACEBOOK PAGE- https://www.facebook.com/My-Student-S...
facebook group NURSING NOTES- https://www.facebook.com/groups/24139...
FOR MAKING EASY NOTES YOU CAN ALSO VISIT MY BLOG –
BLOGGER- https://mynursingstudents.blogspot.com/
Instagram- https://www.instagram.com/mystudentsu...
Twitter- https://twitter.com/student_system?s=08
#small, #large ,#intestine ,#BORN,#ASSESSMENT, #APPEARENCE,#PULSE,#GRIMACE,#REFLEX,#RESPIRATION,#RESUSCITATION,#NEWBORN,#BABY,#VIRGINIA, #APGAR, #OXYGEN,#CYANOSIS,#OPTICNERVE, #SARACHNA,#MYSTUDENTSUPPORTSYSTEM, #rashes,#nursingclasses, #communityhealthnursing,#ANM, #GNM, #BSCNURING,#NURSINGSTUDENTS, #WHO,#NURSINGINSTITUTION,#COLLEGEOFNURSING,#nursingofficer,#COMMUNITYHEALTHOFFICER
study of structures and functions of the gastrointestinal tract
- histology of the oral cavity
- histology of the pharynx
- histology of the esophagus and stomach
- histology of intestine
- histology of the liver and pancreas
Introduction to digestive system
Organs of digestive tract
Mouth and their different enzymes and actions
salivary glands
Oesophagus
Stomach
Small Intestine and funcions
Large Intestine and functions
Anus
Assessary Organs
Liver
Pancreas
Digestive system Physiology
Ingestion
Digestion
Absorption
Assimilation.
Excretion
1st Semester Anatomy - Digestive System - GIT - By thirumurugan.pptxthiru murugan
Digestive System:
Also known as gastrointestinal tract, digestive tract, digestional tract, GI tract, GIT, gut, or alimentary canal.
Consist of alimentary tract and Accessory organs
It involve in Ingestion, Digestion, Absorption and Excretion
It is started from mouth and ended at anal canal, that is assisted and supported by many parts.
Parts of Digestive System: Primary digestive organs & Accessory organs
Primary digestive organs: Mouth, Pharynx, Esophagus, Stomach, Small Intestine, Large Intestine, Rectum, Anal canal
Accessory organs: Teeth, Tongue, Salivary glands, Liver, Gallbladder, Pancreas.
Mouth
First part of GIT, Also known as oral or buccal cavity, It consist of muscles & bones
Tongue or Lingua:Voluntary muscular structure, Occupies floor of mouth
Superior surface consist of numerous papillae contains taste bud for the sense of taste. Attached inferiorly with hyoid bone, Highly mobile muscular part of GIT.
Teeth: Teeth are the hard and whitish substances present in the mouth Which is essential for chewing & speech. They fixed in socket of alveolar ridge in mandible & maxilla (Jaw). Diphyodont is a type of dentition in which two successive sets of teeth are developed during the lifetime. The first set of teeth is temporary or deciduous or milk and the other set is permanent teeth
Salivary glands: These are exocrine glands found in oral cavity that secrete complex fluid known as saliva
Types: Major & Minor salivary glands
Major salivary gland: Parotid, Submandibular & Sublingual
Minor salivary glands: There are 450 minor salivary glands present in oral cavity, lips, cheeks, palate and floor of the mouth
Pharynx: Wide, muscular tube situated behind the nose, mouth & larynx
Cavity of pharynx divided into nasopharynx, oropharynx and laryngopharynx.
Esophagus: The esophagus is a fibromuscular tube, approximately 25cm in length,
It transports food from the pharynx to the stomach.
Stomach: The stomach is a hollow organ in the GIT.
It is the “J” shaped dilated part, situated in the upper part of the abdomen.
Gross Anatomy of stomach: The stomach has four main anatomical divisions; the cardia, fundus, body and pylorus:
Cardia: surrounds the superior opening of the stomach. it consist cardiac sphincter
Fundus: the rounded, often gas filled portion superior to and left of the cardia.
Body: the large central portion inferior to the fundus.
Pylorus: This area connects the stomach to the duodenum. It is divided into the pyloric antrum, pyloric canal and pyloric sphincter.
Pancreas: The pancreas is a soft, finely lobulated, elongated dual (Exo Endocrine) gland.
Liver: It is the largest gland of the body. It involve metabolic activities
The liver is one of the vital organs of the body, responsible for chemical actions that the body needs to survive.
Small intestine: The intestine which is the longest part of the digestive tube is divided into small intestine and large intestine.
Large Intestine or Colon: It is a last part of the GIT
This my original work on Anatomy of digestive system, therefore it is strongly forbidden to copy, share and foreword without the permission of the authors to the third person or anybody else.
Anatomy & Physiology of GIT: It covers Organs of the Digestive system, Structure of the Alimentary canal, Mouth, Salivary glands, Pharynx, Oesophagus, Stomach, Small intestine, Large intestine, Rectum & Anal canal, Pancreas, Liver, Biliary tract
2. DIGESTION • The process of conversion of complex food substances to simple absorbable forms is called digestion. • Digestion is carried out by our digestive system by mechanical and biochemical methods.
3. PHASES OF DIGESTION • The activities of the digestive system can be grouped under five main headings. • Ingestion :-This is the taking of food into the alimentary tract, i.e. eating and drinking. • Propulsion :-This mixes and moves the contents along the alimentary tract. • Digestion :-This consists of: • Mechanical breakdown of food by mastication(chewing). • Chemical digestion of food into small molecules by enzymes present in secretions produced by glands and accessory organs of the digestive system
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2. INTRODUCTION
Digestion is the mechanical and chemical
breakdown of food into forms that cells can absorb.
• Mechanical Digestion – breaks down food into smaller pieces
Chemical Digestion – decomposes food into smaller molecules
•
The digestive system consists of:
• The alimentary canal – extends from mouth to anus
•
Accessory glands –secrete chemicals into the alimentary canal.
4. THE ALIMENTARY CANAL
• If stretched out, the alimentary canal is
about 8 meters long. That’s 26 feet!
• The alimentary canal (A.C.) wall has four
distinct layers that differ from region to region.
5. STRUCTURE OF THE WALL
• Mucosa – mucous membrane
• Epithelial tissues on a bed of connective tissue (lamina propria).
• Makes direct contact with the lumen
• This layer absorb nutrients, secrete chemicals, and protect the
underlying layers.
• Submucosa – Beneath the mucosa
• Loose connective tissue
• Blood vessels, nerves, and lymphatic vessels
• This layer nourishes the surrounding tissues, and carries away
nutrients.
6. STRUCTURE OF THE WALL
• Muscular – provides movements within the A.C.
• Inner coat = transverse muscles: decrease the diameter of the A.C.
• Outer coat = longitudinal muscles: shortens length of the A.C.
• Serosa – serous membrane
• Composed of visceral peritoneum in most places
• Secretes serous fluid, which lubricates the A.C.
7. Figure 17.3 The wall of the small intestine, as in other portions of the
alimentary canal, consists of four layers: An inner mucosa, a
submucosa, a muscular layer, and an outer serous layer.
8. MOVEMENTS OF THE ALIMENTARY CANAL
Muscles of the A.C. provide two basic movements:
• Segmentation – mixing movement
• Smooth muscles contract and
relax, mixing foods with digestive
juices.
•Peristalsis – propelling movement
• Smooth muscles contract in a wave-like motion
pushing food through the alimentary canal.
Figure 17.4 (b) segmentation mixes the contents of the small
intestine. (c) Peristaltic waves move the contents along the canal
9. INNERVATION OF THE ALIMENTARY CANAL
• Enteric Nervous System –
subdivision of the ANS that innervates the alimentary canal.
•Submucosal plexus – controls secretions
•Myenteric plexus – controls gastrointestinal motility
•Remember:
• Parasympathetic impulses – increase activities of digestive system
• Sympathetic impulses – inhibit certain digestive actions
10. THE MOUTH
• The mouth:
• Receives food
• Mechanically breaks up solid particles using saliva
• Prepares food for chemical digestion
• This action is called mastication
• The mouth also functions as an organ of
speech, and sensory reception.
11. BOARDERS OF THE MOUTH
• The cheeks form the lateral walls of the mouth
• Buccinator muscle + buccal fat pad (gives form to cheeks)
• The lips form the anterior boarder
•Highly mobile structures that surround the mouth opening
•Orbicularis oris skeletal muscle
•Semitransparent epithelium, and a good blood supply makes the lips appear red.
•Highly innervated by sensory receptors
12. THE TONGUE
• The tongue is a thick, muscular organ that occupies the floor of
the mouth and nearly fills the oral cavity when the mouth is closed
Mucous Membrane – covers the surface of the tongue
Lingual Frenulum – membranous fold, anchors the tongue to the floor of the mouth.
Body – largely composed of skeletal muscle
• Manipulate foods and aids in swallowing
Root – posterior portion of the tongue
• Anchored to the hyoid bone.
• Covered with lingual tonsils
Papillae – projections on the surface of the tongue.
• Some provide friction, others house taste buds.
13. THE PALATE
• The palate forms the roof of the oral cavity
Hard Palate - bony roof of the mouth
• Formed by the palatine bones and portions of the maxilla
Soft Palate - Muscular arch
Uvula – cone-shaped projection
During swallowing, muscles draw the soft palate and the uvula upward
preventing food from entering the nasal cavity.
Figure 17.7 Sagittal section of the
mouth, nasal cavity, and pharynx.
14. THE TEETH
Teeth are the hardest structures in the body
•primary (deciduous) teeth numbering 20
•Usually erupt through the gums from age of 6 months to 2 years
•secondary (permanent) teeth numbering 32
•Usually begin to erupt at 6 years
• 3rd molars = wisdom teeth, which may erupt between 17-25 years of age
Figure 17.8 This partially dissected child’s skull
reveals primary and developing secondary teeth in
the maxilla and the mandible.
15. TYPES OF TEETH
Incisors- blade shaped teeth that bite or cut off large pieces of food
Adult – 8 incisors
Child – 8 incisors
Canines- cone shaped teeth that grasp and tear food
Adult – 4 canines
Child – 4 canines
Premolars – flattened surface for grinding food
Adult – 8 premolars
Child – 0 premolars
Molars – flattened surface for grinding food
Adult – 12 molars
Child – 8 molars
16.
17. TOOTH ANATOMY
Enamel- Calcium salts; hardest structure in the body.
Dentin- Living cellular tissue similar to bone.
Pulp cavity- Filled with loose connective tissue, blood vessels, and nerves
Crown- portion of tooth above the gums (gingiva)
Root- portion of tooth below the gums (gingiva)
Root canal – entrance into the pulp cavity
Tooth attachments to the jaw
Cementum – bone-like layer surrounding the root
Periodontal ligaments – attaches the tooth to the jaw
18. DENTAL CARIES
Microbes on the surface of teeth metabolize carbohydrates from foods left in the mouth.
• Their acidic wastes dissolves and the destroys the enamel and dentin.
• Dental caries form when the damage spreads to the underlying dentin.
Figure 17A Actinomyces bacteria (falsely
colored) clinging to teeth release acids that
decay tooth enamel (1,250X)
19. SALIVARY GLANDS
• Salivary glands secrete saliva
•Saliva moistens the food, and begins the digestion of carbohydrates
Three pairs of major salivary glands, include:
Parotid glands – located anterior to the ear
• A parotid duct enters the mouth opposite the second upper molars
Submandibular glands – located on the floor of the mouth inside the jaw.
Sublingual glands – located on the floor of the mouth, inferior to the tongue.
•Many minor glands are also scattered throughout
the mucosa of the tongue, palate, and cheeks
21. SALIVARY GLANDS
There are two types of secretory cells within the salivary glands:
• Serous cells produce a watery fluid with digestive enzymes (salivary amylase)
• Mucous cells secrete mucous
• Parotid glands
• Secrete clear watery, serous fluid
• Rich in salivary amylase – begins the chemical digestion of carbohydrates
•Submandibular glands
• Secretes a mixed saliva with both serous fluid and mucus
•Sublingual glands
• Secrete primarily mucus