GI Sequence - Histology

Small and Large IntestinesRecto-anal junction

January 16, 2008

#29 Small Intestine

Mesentery (ct + epithelium)

Submucosa (connective tissue)

Mucosa (epithelium + lamina propria)

Muscularis Externa (smooth muscle)

Lumen

Muscularis mucosae

#29 – Intestinal Villi

Intestinal villi

#29-Simple columnar epithelium with striated border (microvilli) and goblet cells

Microvilli (striated border)

Goblet cells

Enterocytes?

Pylolic StomachPylo-duodenal junction (arrow)

Pyloric sphincter muscle

#161 Pylo-duodenal J. with Pancreas

Pyloric stomach

Duodenum

Pancreas

#161

Muscularis mucosae

Lymphatic nodules

Brunner’s gland

#161, 162 Duodenum

Lumen

Intestinal villus

Muscularis mucosae

?

? crypts or i. glands

Brunner’s glands pancreas

#29, 168, 169, 170 Jejunum or Ileum

lumen

submucosa

Muscularis mucosae

Crypts of Lieberkuhn

#29, Intestinal glands (crypts)

Paneth cells

Enteroendocrine cells

Mitotic cell

??

?

#246

Enteroendocrine cell

Paneth cell

#29, Myenteric (Auerbach’s) plexus

Ganglion cells

#176, 177: Colon (Mucosa of the colon)

m.m

No villi,

Straight glands,

lots of goblet cells

#176 – colon

mucosa

#175: Appendix

Mucosa is like colon: no villi, straight glandsMuscularis externa is like small intestine: Two layers of s. muscleHeavy infiltration of lymphatic tissues forming nodules.

#177-1, 177-3, 177-2 Recto-anal junction

Hemorrhoidal veins

Muscularis mucosae

Type of epithelium changes

Muscularis mucosae fraysDilated veins

Cardio-esophageal

junction (arrow)

Chief cells Paneth cells

Parotid gland acinar cells

von Ebner’s gland

Mixed salivary glands

Serous acinar cells

Serous demilune cells

#170 Small Intestine

#194 Gallbladder

Mucosa epithelium lamina propria

Smooth muscle

Adventitial c.t.

Liver

Simple columnar ep.