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Overview: mucosa

This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa.
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Mucosa <p>This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa.  100x</p>

Mucosa

This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa. 100x

 - Simple columnar epithelium <p>This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa.  100x</p>

- Simple columnar epithelium

This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa. 100x

 - Goblet cells <p>This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa.  100x</p>

- Goblet cells

This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa. 100x

 - Lamina propria -  <p>This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa.  100x</p>

- Lamina propria -

This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa. 100x

 - Intestinal glands <p>This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa.  100x</p>

- Intestinal glands

This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa. 100x

 - Muscularis mucosae <p>This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa.  100x</p>

- Muscularis mucosae

This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa. 100x

 - Villi > <p>Villi are distinguishing features of the small intestine.  They are finger-like projections from the surface of the small intestine into the lumen of the organ.  Villi are composed of a central core of lamina propria covered by its overlying surface epithelium.  The presence of villi are diagnostic for the small intestine.</p>

- Villi >

Villi are distinguishing features of the small intestine.  They are finger-like projections from the surface of the small intestine into the lumen of the organ.  Villi are composed of a central core of lamina propria covered by its overlying surface epithelium.  The presence of villi are diagnostic for the small intestine.

Submucosa > <p>A submucosa of dense connective tissue separates the mucosa from the muscularis externa.</p>

Submucosa >

A submucosa of dense connective tissue separates the mucosa from the muscularis externa.

Muscularis externa > <p>As in many tubular organs, the muscularis externa is composed of an inner circular and an outer longitudinal layer of smooth muscle.  Between these layers is Auerbach’s plexus, a network of autonomic ganglia and nerves that innervate both muscle layers.</p>

Muscularis externa >

As in many tubular organs, the muscularis externa is composed of an inner circular and an outer longitudinal layer of smooth muscle.  Between these layers is Auerbach’s plexus, a network of autonomic ganglia and nerves that innervate both muscle layers.

 - Auerbach’s plexus <p>As in many tubular organs, the muscularis externa is composed of an inner circular and an outer longitudinal layer of smooth muscle.  Between these layers is Auerbach’s plexus, a network of autonomic ganglia and nerves that innervate both muscle layers.</p>

- Auerbach’s plexus

As in many tubular organs, the muscularis externa is composed of an inner circular and an outer longitudinal layer of smooth muscle.  Between these layers is Auerbach’s plexus, a network of autonomic ganglia and nerves that innervate both muscle layers.

Serosa <p>This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa.  100x</p>

Serosa

This innermost layer of the small intestine is the mucosa.  The mucosa is composed of three layers:  a simple columnar epithelium with microvilli and goblet cells; a lamina propria of loose connective tissue in which intestinal glands are located; and a thin muscularis mucosae of smooth muscle.  Beneath the mucosa is the submucosa followed by the muscularis externa and the serosa. 100x