Histology slides of GIT

Esophagus

1. lining epithelium is non keratinized stratified squamous epithelium
2. muscularis mucosae is unusually thick
3. inner circular and outer longitudinal muscles layers present in muscularis externa  : in upper 1/3 of esophagus it contain skeletal muscle , in middle 1/3 it contain both skeletal and smooth muscle and in lower 1/3 it contain only smooth muscle
4. outer most layer is adventitia 

Stomach

1.      lining epithelium simple columnar epithelium

2.      lamina propria contain gastric glands

3.      three smooth muscle cells layers are present in muscularis externa – inner oblique, middle circular and outer longitudinal

4.      outer serosa is present 

Duodenum

1. villi are present {projection of mucosa }
2. Submucosa contain Brunner’s glands
3. lining epithelium simple columnar epithelium
4. muscularis externa contains inner circular and outer longitudinal smooth muscles layers 

Large intestine:

1. lining epithelium simple columnar epithelium with large number of goblet
2. lamina propria contain intestinal glands
3. muscularis externa contains inner circular and outer longitudinal smooth muscles layers

 Gall bladder:

1. it is lined by simple columnar epithelium
2. epithelial diverticula or crypt (Rokitansky-Aschoff sinus)  is present
3. no submucosa
4. fibromuscular layer contain smooth muscle cells  which are randomly oriented  

Appendix:

1. Lining epithelium is simple columnar epithelium
2.  lymphatic nodules (the most characteristic property of the appendix is the presence of lymphatic nodule) are present in mucosae and submucosa
3.  3. Muscularis externa  contains inner circular and outer longitudinal smooth muscles layers
4. 4. outer serosa is present