Intestine Microanatomy

Question 1

differentiate between small intestinal glands (crypts of Lieberkuhn) and villi in small intestine

Answer 1

the small intestinal glands open at the base of the villi and are simple straight tubular glands; also have paneth cells (zymogen granules-acidophilic) and villi

Question 2

differentiate between villi and microvilli in small intestine

Answer 2

villi: finger-like projections from the plicae circulares; central lacteal at center
microvilli: line the villi and the entire small intestines (brush border)

Question 3

differentiate between enterocytes and goblet cells in small intestine and large intestine

Answer 3

enterocytes are the simple columnar epithelium that line the intestinal glands/crypts (simple straight tubular); the glands contain goblet cells

Question 4

differentiate between central lacteal, capillary beds, and smooth muscles within the villi in small intestine

Answer 4

see images

Question 5

differentiate between the mucosal glands (intestinal glands) and submucosal glands in small intestine

Answer 5

musocal glands: adjacent to but do not pass through l. muscularis
submucosal glands: push into l. muscularis (greedy and take up space)

Question 6

differentiate between the submucosal and myenteric ganglia and nerve fascicles and list the structures they innervate

Answer 6

submucosal plexus: ganglia innervate t. mucosa and t. submucosa

myenteric plexus: ganglia innervate t. muscularis and t. serosa/adventitia

Question 7

locate the microvilli on the enterocytes in the large intestine

Answer 7

look at pics

Question 8

compare and contrast the large intestinal glands (crypts of lieberkuhn) with the small intestinal glands (also crypts of lieberkuhn)

Answer 8

large intestine glands have no paneth cells and NO VILLI!!!!!