Histology of large intestine Flashcards
The large intestine comprises
Cecum, colon, rectum, anal canal
The primary function of the columnar absorptive cells
reabsorption of water and electrolytes
Mucosa of large intestine
It contains straight tubular intestinal glands (crypts of Lieberkühn)
Smooth surface of mucosa
NO plicae circulares Nor villi are present
Cells of mucosa
Colonocytes
Goblet cells
Enteroendocrine cells
Stem cells
The lower third of the gland constitutes the intestinal
Mucosal Cells occur with goblet cells, which have
apical mucin granules
The ratio of goblet cells to enterocytes, is greater in the ___ than the ___
colon than in the small intestine
Submucosa
Dense irregular CT and large accumulation of fat cells, blood vessels, Meissner’s plexus, and lymphatic tissue
Outer layer of muscularis externa
condensed
into prominent longitudinal bands
of muscle called teniae coli
The most conspicuous feature of the appendix is the
large number of lymphatic nodules that extend into the submucosa
The appendix is covered by a ___ that is continuous with the 2.
1) serosa
2) mesentery of the appendix
Upper part of rectum
transverse rectal folds
Immediately above the anal valves, the mucosa forms longitudinal folds called the
columns of Morgagni
The rectal mucosa lined by
Simple columnar epithelium
