Question

From the esophagus to the anus, the walls of the alimentary canal have the same four basic tunics. The __________ is the outermost layer of the walls of the intraperitoneal organs.

A. muscularis
B. mucosa
C. serosa
D. submucosa

Answer 1

The serosa is the outermost layer of the alimentary canal in the intraperitoneal organs, consisting of a layer of visceral peritoneum over loose connective tissue.

Step-by-step explanation:

From the esophagus to the anus, the walls of the alimentary canal have the same four basic tunics. The serosa is the outermost layer of the walls of the intraperitoneal organs. The layers, beginning from the innermost to the outermost, are the mucosa, submucosa, muscularis, and serosa. The serosa includes a layer of visceral peritoneum overlying a layer of loose connective tissue and is specific to the regions of the alimentary canal within the abdominal cavity. This contrasts with areas such as the mouth, pharynx, and esophagus, which instead have a layer called the adventitia.