Question

Define the layers of the alimentary canal ​

Answer 1

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Question:-

Define the layers of Alimentary Canal ?

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Firstly ,

What is Alimentary Canal?

• Alimentary Canal is also known as Gastrointestinal Tract .
• it is the path by which food enters the body and solid wastes are expelled.
• The organs of Alimentary Canal are mouth, pharynx, esophagus, stomach, small intestine, and large intestine.

Now,

Define the layers of Alimentary

Canal.

• there are four layers in the Alimentary Canal are mucosa, submucosa, musclaris externa, and serosa.

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What is Mucosa ?

• Lamina is the another name of Mucosa.
• It is the innermost layer and its function is of absorption and secretion.

What is Submucosa ?

• tela submucosa is the another name of Submucosa.
• It contains goblet cells and consist of irregular layer of connective tissues.
• it functions to promote local stirring at the mucosal surface.

What is Musclaris externa?

• tunica, in Latin can be also be used instead of musclaris externa.
• it function to aid in propelling nutrients in a uniform direction from the lumen to the submucosa.
• it consists of an inner circular layer and a outer muscular layer.

What is Serosa ?

• visceral peritoneum is the another name for Serosa.
• it is a smooth membrane consisting of a thin layer of cells.
• its function is to secrete a lubricating fluid which reduces friction from muscle movement. 

Answer 2

Explanation:

The walls of the alimentary canal have the same four basic layers, (also known as tunics) — the mucosa, submucosa, musclaris externa, and serosa. Each layer contains a certain tissue type that plays a crucial role in the breakdown of food.

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 a watery secretion to reduce friction while digestive organs are moving.

Smooth Muscle

A form of muscle that contains short, tube-like (fusiform) single-nucleated cells; smooth muscle range from having many layers to a single layer of cells; smooth muscle is found in the walls of hollow organs.

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. The submucosa also contains capillaries and lymph vessels.