Small intestine Divided into three parts: duodenum jejunum ileum Function: *digestion *absorption secreted certain hormones
Small intestine Divided into three parts: duodenum jejunum ileum Function: *digestion *absorption *secreted certain hormones
Mesentery Plica Mucosa Submucosa Circular- muscle 美集 Longitudinal muscle Serosa Submucosal glands i
Vein carryin hepatic port Muscle layers Lumen Large circular folds Villi (a) Plicae circulares a fold of mucosa and submucosa in the lumen of digestive tract
Plicae circulares : a fold of mucosa and submucosa in the lumen of digestive tract
Intestinal villi *small finger-or lea found only in the s Absorptive cells Lacteal *varying in the forr Goblet ce *being covered by e Blood capillaries *having a core of la capillary network, few smooth muscleestinal crypt iscularis mucosae odenal glands Subn
*small finger- or leaf-like projection of the mucosa, found only in the small intestine; *varying in the form and height in different region *being covered by epith. *having a core of lamina propria with capillary network, a central lacteal and few smooth muscle fibers. Intestinal villi
microvilli: the minute projections (1 um long and about 0.1 um wide)of cell membranes Microvilli The inner surface of small intestine can be greatly enlarged by: plicae circularesX 3. villiX 10. microvilliX 20
microvilli: the minute projections (1 µm long and about 0.1 µm wide) of cell membranes The inner surface of small intestine can be greatly enlarged by: * plicae circularesX 3. * villiX 10. * microvilliX 20