GI Tract 2 Flashcards
Esophagus - strat squam ep.
Loose CT
mucosa
dense irregular CT
sebacous glands
submucosa
upper portion = skeletal muscle, voluntary
lower portion = smooth muscle, involuntary
muscularis externa
Stomach - simple columnar ep.
mucosa
apical ep. secretion
mucous, acid, proteases
basal ep. secretion
hormones, paracrine factors
thickening; @ cardiac and pyloric openings = sphincters
muscularis externa
strat squam –>cuboidal
gastro-esophageal junction
secrete zygomens; actiivated by acid hydrolysis (pepsin)
chief cells
secrete peptides - increase peristalsis
secrete gastrin - releases pyloric sphincter
DNES cells
absorptive mucosa
simple columnar, goblet cells, paneth cells, loose CT
lacteal
small intestine
mucous secretions “Brunner’s Glands” protects acid from stomach
submucosa
absorptive, no villi, crypts/glands
mucosa of large intestine
no Brunner’s glands
submucosa of large inestine
anal sphincters, smooth muscle internally, skeletal muscle extrenally
muscularis externa