The Esophagus Differs from the Rest of the Alimentary Tract

Question

The esophagus differs from the rest of the alimentary tract in that it possesses no ________.
A)Adventitia
B)Muscularis
C)Mucosa
D)Serosa

Accepted Answer

The esophagus is located outside the peritoneal cavity and is therefore not covered by a serosa. Instead, it has an adventitia, which is a layer of connective tissue that binds it to adjacent structures. The esophagus does have a muscularis layer to help move food towards the stomach and a mucosa layer to secrete mucus and protect the lining.