histology of the GIT

Question 1

Submucosa function

Answer 1

structural support

Question 1

mucosa function

Answer 1

protection, absorption, secretion

Question 2

muscularis function

Answer 2

allows movement

Question 3

serosa / adventitia function

Answer 3

attaches gut tube to surrounding structures

Question 4

three layers of the mucosa

Answer 4

epithelium
lamina propria (connective tissue)
muscularis mucosae (smooth muscle)

Question 5

composition of submucosa

Answer 5

dense irregular connective tissue - blood vessels, nerves of the enteric plexus

Question 6

composition of the muscularis externa

Answer 6

two layers of smooth muscle
inner circular layer, outer longitudinal layer
nerves of the enteric NS

Question 7

Composition of the serosa / adventitia

Answer 7

adventitia (retroperitoneal structures)
serosa (intraperitoneal structures)

Question 8

what bits of the enteric nervous system are in the submucosa?

Answer 8

messiner’s plexus

Question 9

what bits of the enteric NS are in the muscularis externa?

Answer 9

auerbach’s plexus