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  • The alimentary canal is composed of four layers of tissues. Out of these four, the one containing nerve plexus is  Option: 1 <p

The alimentary canal is composed of four layers of tissues. Out of these four, the one containing nerve plexus is

 

Option: 1

Mucosa


Option: 2

Submucosa


Option: 3

Serosa


Option: 4

Muscularis

 


Answers (1)

best_answer
 

1. Mucosa: It is composed of simple epithelium cells and a thin connective tissue - areolar tissue. The layer of areolar connective tissue is called lamina propria. In addition, the mucosa has a thin, smooth muscle layer, called the muscularis mucosa. Mucosa forms glands in the stomach (gastric glands) and crypts in between the bases of villi in the intestine (crypts of Lieberkuhn).

2. Submucosa: The submucosa is relatively thick, is highly vascular and serves the mucosa. It is made up of dense connective tissue. It also contains glands and nerve plexus.

3. Muscularis: It is also the muscularis externa. The muscularis is composed of two layers of muscle: an inner circular and outer longitudinal layer of smooth muscle. The stomach contains an additional layer of oblique muscles.

4. Serosa: It is present only in the region of the alimentary canal within the abdominal cavity. Instead of serosa, the mouth, pharynx, and oesophagus have a dense sheath of collagen fibres called the adventitia.

The submucosa is relatively thick, is highly vascular and serves the mucosa. It is made up of dense connective tissue. It also contains glands and nerve plexus. Hence, the correct answer is option b.

Posted by

Devendra Khairwa

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