The thick connective tissue layer of the digestive tract that contains blood vessels, small glands, and a nerve plexus is the
a. mucosa layer.
b. submucosa layer.
c. muscularis layer.
d. serosa (adventitia) layer.
Answer: B
Feedback : The submucosa is the thick connective tissue layer containing blood vessels, small glands, and a nerve plexus called the submucosal nerve plexus.