Multiple choice

The innermost layer of the mucosa is

  1. serous membrane

  2. muscular coat

  3. mucosa

  4. submucosa

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mucosa is the extensively folded innermost layer. It can be divided into the epithelium, lamina propria, and the muscularis mucosae, though some consider the outermost muscularis mucosae to be a distinct layer, as it develops from the mesoderm rather than the endoderm (thus making a total of five layers).