LAYERS OF DIGESTIVE TRACT

Question 1

MUCOSA

Answer 1

-innermost layer
-stratified squamous from mouth to esophagus and simple columnar from stomach to rectum
-LAMINA PROPIA: loose connective tissue
-MUSCULARIS MUCOSA: smooth muscle, increasing SA

Question 2

SUBMUCOSA

Answer 2

-2nd innermost layer
-irregular connective tissue
-contains blood vessels, lymphatic, nerve plexus and glands secreting into lumen

Question 3

MUSCULARIS EXTERNA

Answer 3

-2nd outermost layer
-circular muscles near inside and longtudinal muscles along outside
-motility that moves food through tract

Question 4

SEROSA

Answer 4

-outermost layer
-areolar tissue covered in simple squamous epithelium
-also known as visceral peritoneum