Submucosal (Meissner’s) plexus and the myenteric (Auerbach’s) plexus
Symps modulate (not part of ENS) - sphincter tone (smooth muscle) and vascular tone
Path of bile
hepatocytes, bile canaliculi, (interlobular) bile ductules, left and right hepatic ducts, common hepatic duct, common bile duct, hepatopancreatic ampulla/sphincter, major duodenal papilla and finally into the duodenum.
distal esophagus, stomach, 1st & 2nd parts of the duodenum, liver, gallbladder and pancreas
greater splanchnics (T5-9), anterior vagal trunk
from 3rd part of duodenum to prox 2/3 of transverse colon
lesser and least splanchnics (T10-12), posterior vagal trunk
5 differences between ileum and jejunum
Vasa recta are long in the jejunum and short in the ileum.
Arterial arcade loops are large & few in the jejunum and short & many in the ileum.
Encroaching fat is not found on the jejunum but on the ileum.
Circular folds (plicae circulares) are large, tall & closely packed in the jejunum but low & sparse in the ileum.
The ileum has aggregated lymphoid nodules (Peyer’s patches).