Unit 3 Layers and Structures of the Digestive System

Mucosa

Submucosa

Muscularis Externa

Function: Controls peristalsis

Function?

Serosa

Function: Produce serous fluid

Function? Consists of loose CT and simple squamous epithelium

Mucosa - Epithelium

What is found on the innermost layer of the digestive tract?

Note: This is not a particular kind of cell

Mucosa - Glands

(I.e. Gastric glands, intestinal glands)

Layer of pits/glands?

Mucosa - Lymphoid Tissue/MALT

Function: Initiate local immune system response depending on location

Function?

Mucosa - Muscularis mucosae

Submucosa - Dense, irregular CT

Submucosa - Glands, Brunner’s glands

Function: Produce mucous

Name of kind layer of glands? Function?

Submucosa - Lymphoid tissue

Layer of lowest label?

Mucularis - Inner circular layer

Blacked out layer? Note: Intestines only

Muscularis - Myenteric plexus

Function: Produces peristaltic movement

Function?

Muscularis - Outer longitudinal layer

Serosa