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Layers of the Alimentary Canal

Layers of the Alimentary Canal

Author: Aaron Mullally
Description:

This lesson will describe the structure, including the four layers, of the digestive tract.

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Tutorial
Terms to Know
Digestive Tract

Technically is called the alimentary canal, the digestive tract consists of the organs that perform the main functions of the digestive system: ingestion, digestion, absorption, and excretion. The organs of the digestive tract are the: mouth, esophagus, stomach, small intestine, colon (large intestine), rectum and anus.

Lumen

The name used to describe the hollow part of a hollow/tubular organ.

Mucosa

The mucous membranes of the alimentary canal, this is the layer of tissue of the alimentary canal that is in direct contact with its lumen.

Serosa

The outermost layer of tissue of the alimentary canal that produces and secretes a watery secretion to reduce friction while digestive organs are moving.

Smooth Muscle

The tissue layer of the alimentary canal that controls its muscular movements, also called the muscularis.

Sphincters

Sphincters are muscles that control the openings between organs; sphincters control what enters and exits various organs.

Submucosa

The layer of tissue just below the mucosa, the submucosa contains glands that secrete onto the mucosa and well as capillaries and lymph vessels.