All of the following structures have all four tissue layers in their walls except the
A) esophagus.
B) mouth.
C) stomach.
D) sigmoid colon.

Question

Quizplus · Accepted Answer

The mouth only has three tissue layers in its wall, as it lacks the muscularis externa layer. The other structures listed (esophagus, stomach, sigmoid colon) all have all four tissue layers (mucosa, submucosa, muscularis externa, serosa/adventitia) in their walls.

All of the Following Structures Have All Four Tissue Layers