1. Gi Microanatomy LECTURE

what are the layers of the GI tract?

mucosa

submucosa

muscularis

serosa or adventitia

what are the sublayers of the tunica mucosa?

epithelium

lamina propria

muscularis mucosa

what are the layers of the tunica muscularis?

circular muscle

longitudinal muscle

T/F: the epithelium layer of tunica mucosa is classified based on region and functional needs

true

What type of tissue does the lamina propria contain?

CT, some glands

what type of tissue does the muscularis mucosae contain? what is the importance of this layer?

layers of smooth muscle

allows for independent movement od GI tract

what type of tissue and other cells does the tunica submucosa contain?

DICT, Meissner's plexus, glands

the enteric nervous system has two components. What is the function of the submucosal (Messners) plexus? where is it found?

Secretory, mucosa movement, control local blood flow

within submucosa

the enteric nervous system has two components. What is the function of the myenteric (Auerbach's) plexus? where is it found?

motor, peristalsis

tunica muscularis

what type of tissue and other cells does the tunica muscularis contain?

inner circular and outer longitudinal SM

myenteric plexus found between layers

what type of tissue does the tunica serosa contain?

CT covered by simple squamous (mesothelium)

what type of tissue does the tunica adventitia contain?

CT continous with surrounding fascia

adhered to body wall

In some species it is normal for muscularis mucosa to be absent. When it is absent is submucosa considered its own layer?

no