Small Intestine Anatomy Quiz

Layers of the Small Intestine Wall

• The four layers forming the wall of the small intestine are: mucosa, submucosa, muscularis externa, and serosa.

Mucosa of the Small Intestine

• The macroscopic appearance of the mucosa is velvety due to the presence of intestinal villi.
• The mucosa is composed of a microscopic component, which is formed of simple columnar epithelial cells, covering the intestinal villi.

Corium of the Mucosa

• The main function of the corium (lamina propria) is to provide a supporting layer of connective tissue for the epithelial cells.

Intestinal Villus Structure

• An intestinal villus is a small, finger-like projection that increases the surface area of the small intestine for absorption.
• The structure of an intestinal villus consists of a core of lamina propria, surrounded by a layer of simple columnar absorptive cells.

Absorptive Cells of the Small Intestine

• The shape of the simple columnar absorptive cells is tall and columnar, with a prominent striated border at the apex.

Mucosa Layers

• The mucosa layer that forms a velvet appearance due to the presence of intestinal villi is the mucosa.
• The microscopic component of the mucosa that covers the intestinal villi is composed of simple columnar epithelial cells.

Intestinal Villi Cells

• The type of cells found in the structure of intestinal villi are simple columnar absorptive cells.

Submucosa of the Mucosa

• The layer of the mucosa that contains blood vessels, nerves, and lymphocytes is the submucosa.

Muscularis Mucosa

• The muscularis mucosa is a thin layer composed of two sublayers: an inner circular layer and an outer longitudinal layer.