Histology of the small Intestine

Question 1

Serosa

Answer 1

smooth membrane covered the intestine
A thin film of lymph, permits free motion of the intestines
two elements
1. Visceral peritoneum
2. Loose connective tissue

Question 2

Visceral Peritoneum

Answer 2

Outermost layer

surrounds all of the other abdominal organs

Question 3

Loose connective tissue

Answer 3

Contains blood vessels, nerves, and lymphatic vessels

Question 4

Partietal Peritoneium

Answer 4

Lines the walls of the abdominal cavity

Question 5

Longitudinal (Outer layer) and Circular Smooth Muscle (Inner layer)

Answer 5

Deep to the serosa, two thick layers of smooth muscle

Responsible for peristalsis

Question 6

Peristalsis

Answer 6

Wave- like contractions that sweep along the extent of the intestines, slowly propelling the contents toward the rectum.

Question 7

Submucosa

Answer 7

Loose connective tissue
adjacent to the circular smooth muscle
contains lymph follicles, blood vessels and nerves

Question 8

Lymph Follicles

Answer 8

Temporary structures, temporary collections of white blood cells that gather in response to the appearance of an antigen in the gut. Once gone it disappears.

Question 9

Muscularis mucosa

Answer 9

Thin layer of smooth muscle

Located btwn the submucosa and the lamina propria

Question 10

Intestinal villi

Answer 10

Epithelial lining of the intestine
Finger like folds, Project into the lumen and serve to greatly increase the total surface area of the small intestine
NO VILLI IN THE COLON
Contain arterioles and venules, and lymphatic vessels

Question 11

Simple columnar Epithelium

Answer 11

Line the small and large intestines

Question 12

Lacteal

Answer 12

Lymphatic vessels
contain absorbed nutrients that cannot enter the intestinal capillaries, like large lipid-protein complexes, transported in the lymph vessels to the thoracic duct

Question 13

Nutrients passage way

Answer 13

Absorbed nutrients enter the capillaries and venules of the villi
Go through the veins in the lamina propria, submucosa and serosa
Then go to the hepatic portal circulation
transported to the liver where digestion is completed.