Ch.4 Abdomen : 4.5

Front 1

which contractions help move the food down the tract?

Back 1

peristaltic

Front 2

where does the muscular layers and tissue of GI tract originate from?

Back 2

mesoderm

Front 3

lining/epithelium of GI tract originates from:

Back 3

endoderm

Front 4

sections of the GI tract and the organs in them:

Back 4

foregut: esophagus to the middle of the second part of the duodenum (includes stomach, liver, biliary track and gallbladder,pancreas )
midgut: rest of duodenum to the first 1/3 of transverse colon (don't forget ileum and jejunum too!)
hindgut: last 2/3 of transverse colon to upper anal canal

Front 5

What initiates contractions in the smooth muscles?

Back 5

action potentials

Front 6

What is the venous drainage for the digestive tract?

Back 6

portal vein --> liver ---> hepatic v. ---> IVC

Front 7

parasympathetic nerves are responsible for what in the intestinal tract?

Back 7

contraction and secretion

Front 8

blood supply, and innervation of the foregut:

Back 8

celiac trunk
parasympathetic: vagus n.
sympathetic: greater splanchnic n.

Front 9

blood supply and innervation of the midgut:

Back 9

superior mesenteric a.
parasympathetic: vagus n.
sympathetic: lesser splanchnic n.

Front 10

blood supply and innervation of hindgut:

Back 10

inferior mesenteric a.
parasympathetic: Pelvic splanchnic n.
sympathetic: least splanchnic n.

Front 11

Which fibers of the vagus n. synapse to the wall of the visceral organ?

Back 11

preganglionc

Front 12

What are the two parasympathetic plexuses of the digestive system?

Back 12

submucosal plexus of Meissner, myenteric plexus of Auerbach

Front 13

What do the ganglionic and sympathetic fibers do in the plexus?

Back 13

ganglionic: responsible for integrating and coordinating mobility, secretion and endocrine function
sympathetic: tone of sphincter, sends info to CNS