Question

Choose the correct set of statements about the anatomical features of the alimentary canal:
I. Outermost layer in the wall of the alimentary canal is serosa
II. Secretory glands occur in mucosa layer of the alimentary canal
III. Muscularis layer consists of both longitudinal and circular muscles
IV. Myenteric plexus is the bunch of nerves responsible for controlling gut’s intrinsic peristaltic activity

• A. Only I
• B. Only II
• C. Only III and IV
• D. I, II, III, IV

Answer 1

The correct option is D I, II, III, IV

Layers of the alimentary canal, among others, include serosa, muscularis, sub-mucosa and mucosa.

The outermost layer, serosa is made up of mesothelium and some connective tissues.

The mucosa layer of the stomach has gastric glands and Crypts of Lieberkuhn (intestinal glands). The mucosa layer also has unicellular glands (goblet cells) that secrete mucus.

Muscularis layer consists of both longitudinal and circular muscles.

The myenteric plexus is located between the inner and outer muscle layers of the muscularis externa. It is a bunch of nerves responsible for controlling the gut's intrinsic peristaltic activity.