Digestive System Flashcards
Four Principal Layers of the GI tract:
Mucosa/mucous membrane
Submucosa
Muscularis / Muscularis externa
Serosa
Mucosa/mucous membrane
muscularis mucosa
Submucosa
ubmucosal nerve plexus / meissner’s nerve plexus
Muscularis / Muscularis externa
myenteric nerve plexus / auerbach’s nerve plexus
Serosa
mesothelium
columnar all over,
except in the esophagus
and the lower part of
anal canal where it is
stratified squamous.
EPITHELIUM
- Made up of collagen and reticular fibers.
- contain blood capillaries, lymph vessels and nerves
- In SI, the core of villus is attached to the lamina propria.
- Prominent aggregation of lymphatic tissue is seen in Lamina propria
LAMINA PROPRIA
At numerous places
epithelium dips into the
Lamina propria and form
crypts (Simple tubular glands).
Crypts
- Contraction of Muscularis
Mucosa is important for the local
mixing of intestinal contents - It changes the shape of mucosa,
that helps in absorption and
secretion
MUSCULARIS MUCOSAE
2 LAYER OF MUSCULARIS MUCOSAE
Inner layer
Outer layer
MUSCULARIS MUCOSAE
Inner layer _____
Outer layer _____
Circular
Longitudinal
The Digestive System
7 Digestive Tract
Oral cavity
Mouth
Esophagus
Stomach
Small Intestine
Large Intestine
Rectum
Anus
The Digestive System 4 Glands of the Digestive
system
Salivary Glands
Liver Glands
Pancreas
Gall bladder
A mass of striated muscle covered by
mucous membrane whose structure varies according
to the region
Tongue
4 types of papillae
- Filiform papillae
- Fungiform papillae
- Foliate papillae
- Circumvallate papillae
is both exocrine and endocrine organ that digest
food and secrete hormones; its main function is to continue
the digestion of CHO initiated in the mouth.
Stomach
32 permanent teeth
( 2 incisor; 1 canine; 2 premolars and
3 molars/quadrant); 20 deciduous teeth;
3 parts of the stomach
- Cardia
- Fundus/ Body
- Pylorus