Histology Embryology General plan of digestive tract Except for oral cavity and pharynx, all other organs share a similar histological plan Submucosal Nerve plexus Gland in submucosa Meeney 1. Mucosa Duct from 2. Submucosa 3. Muscularis externa Mucosa submucosa Muscularis Serosa Circular Connective 4 Adventitia epithelium muscle tssue amana propn LongitudinallPeritoneum Muscularis muscle from lumen(inside)out
General plan of digestive tract ---Except for oral cavity and pharynx, all other organs share a similar histological plan 1. Mucosa 2. Submucosa 3. Muscularis externa 4. Adventitia from lumen (inside) out
Histology Embryology Inner layer: the mucosa x (mucous membrane) Three sub-layers epithelium Mucosa: Epithelium lamina propria(may Lamina propria Muscularis mucosae contain glands) Muscularis mucosae (Smooth muscle) Gland in mucosa Duct of gland outside alimentary canal
Inner layer: the mucosa* (mucous membrane) Three sub-layers – epithelium – lamina propria (may contain glands) – Muscularis mucosae (Smooth muscle) *
Histology Embryology surface 1, Epithelium two types stratified squamous simple columnar epith 2、 Lamina propria LCT. contained small glands, blood lymph capillaries. mucosa-associated lymphoid tissue 3. Muscularis mucosa inner circular/outer longitudinal layer depth of smooth muscle cells
Mucosa 1. Epithelium -------two types stratified squamous & simple columnar epith. 2. Lamina propria LCT. contained small glands，blood & lymph capillaries. mucosa-associated lymphoid tissue 3. Muscularis mucosa inner circular / outer longitudinal layer of smooth muscle cells. depth surface
Histology Embryology the submucosa米 Submucosal nerve plexu LCT with small blood Gland in submucosa lymphatic vessels; glands only in the esophagus and Submucosa duodenum Submucosal( meissner autonomic) nerve plexus Duct of gland outside alimentary can
the submucosa* * – LCT. with small blood / lymphatic vessels; * glands only in the esophagus and duodenum – Submucosal ( Meissner’s autonomic) nerve plexus
Histology Embryology THAINTE五 Pica afford of mucosa and submucosa y MM ongitudinal/ circular form CM LM 南W
GI Plica *a fold of mucosa and submucosa *longitudinal/circular form