Title: SMALL INTESTINE
Headings: SMALL INTESTINE
SMALL INTESTINE
Anatomic features
MUCOSA
Function:
Composition:
SUBMUCOSA
BRUNNER GLANDS
MUSCULARIS EXTERNA
Function:
SEROSA (PERITONEUM)

Content: in submucosa of duodenum. Function: secretion of neutral and alkaline glicoproteins and bicarbonate ions  (pH 8.1 - 9.3), protection the proximal small intestine by neutralizing the acid-containing chyme. Composition: branched tubuloalveolar glands with protein-secreting and mucus-secreting cells. MUSCULARIS EXTERNA
Function: Segmentation - local contractions of circular muscle layer for mixing chyme with  digestive juices and moving it into contact with the mucosa for  absorption. Peristalsis - largely involves the longitudial muscle layer and moves the intestinal  contents distally. Composition: Two layers of smooth muscle (inner - circular, outer - longitudinal), nerve network and ganglion neurons (Auerbach's plexus).