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Digestive sys


Layers of the Digestive Tube Digestive Epithelium, Lamina Propria(Basement Membrane), Submucosa, Muscularis Externa, Adventitia
Digestive Epithelium Stratified Squamous ET - oral cavity, pharynx (inferior to nasopharynx), esophagus, anus; Columnar ET - most of the rest of the digestive tract
Lamina Propria(Basement Membrane) Loose CT with blood vessels, nerves, lymph vessels, smooth M. Epithelium + Lamina Propria = Mucosa
Submucosa Loose CT, blood vessels, lymphatics and nerve plexi. The nerves are sympathetic, parasympathetic and sensory.
Muscularis Externa Smooth M: a) inner is circular, b) outer is longitudinal. Movements are coordinated by neurons of mygenteric plexus (Auerbach plexus). Sympathetic and parasympathetic nerves between Sm M layers.
Adventitia. Loose CT In oral cavity, esophagus, and rectum the adventitia has high amounts of collagen that firmly attaches the tract to adjacent structures.
mesenteries double sheets of peritoneal membranes; Portions of the digestive tract are suspended within the peritoneal cavity by sheets of serous membrane that connect the parietal peritoneum with the visceral peritoneum
peritoneal fluid lubricates opposing parietal and visceral surfaces
Peristalsis Peristalsis and segmentation are triggered by Smooth M pacesetter cells in response to chemical or physical stimulation.
Local peristaltic movements are triggered: by sensory receptors in the walls of the digestive tract and by motilin ( hormone ).
Created by: togini