View
3
Download
0
Category
Preview:
Citation preview
Histology of the Digestive System
Basic Histological Layers1. Mucosa
a. Epitheliumb. Lamina Propriac. Muscularis Mucosae
2. Submucosaa. Submucosal plexus
“Plexus of Meissner”3. Muscularis
a. Myenteric plexus“Plexus of Auerbach
4. Serosa
Histology of the Mucosa
Simple ColumnarLarge Intestine
Nonkeratinized Stratified SquamousEsophagus
Nonkeratinized Stratified SquamousAnus
Simple ColumnarSmall Intestine
Simple ColumnarStomach
Nonkeratinized Stratified SquamousPharynx
Nonkeratinized Stratified SquamousMouth
EpitheliumOrgan
Histology of the Mucosa
L: Plicae circulares, Villi S: Crypts of Lieberkuhn, microvilli
Small Intestine
L: Haustra S: Intestinal glandsLarge Intestine
L: Rugae, S: gastric pitsStomach
noneEsophagus
Folds of the epitheliumOrgan
Histology of the Submucosa
Brunner’s glandsDuodenum
NoneLarge Intestine
Peyer’s PatchesIleum
NoneStomach
Submucosal mucous glandsEsophagus
Specialized structuresOrgan
Histology of the Muscularis
2, circular and longitudinalSmall Intestine
2, circular and longitudinalLarge Intestine
3, oblique, circular, and longitudinalStomach
2, circular and longitudinalEsophagus
Smooth muscle layersOrgan
Histology of the Serosa
Visceral Peritoneum Large Intestine
AdventitiaAnus
Visceral Peritoneum Small Intestine
Visceral Peritoneum Stomach
Adventitia due to the fact that the esophagus is not in a cavity
Esophagus
SerosaOrgan
Esophagus
Esophagus
Esophagus
Esophagus of cat
Stomach fundus Mucosa
1. Shallow gastric pits2. Simple branched tubular
glands3. Crowded glands with
minimal CT lamina propria
Stomach fundus Mucosa
Stomach fundus Mucosa
Stomach fundus Mucosa
Fundus Mucosa:Parietal acidophilic cells and chief basophilic cells
Stomach Pylorus Mucosa
Stratified sq epithelium
No Stratified sq epithelium
Small intestineVilli and crypts
TS view of the duodenumBrunner’s glands
Duodenum: Brunner’s glands
Ileum: Peyer’s patches
Ileum: Peyer’s patches
Appendix lymphoid follicles all around
lymphoid follicles all around, no villi
High power view of the colon demonstrating intestinal glands
Large Intestine
Recommended