Which of the following layers of the digestive tract surrounds the muscularis mucosae, consists of dense irregular connective tissue, contains large blood vessels and lymphatics, and contains a nerve plexus that innervates the innermost layer?

this is the SUBMUCOSA

Explanation:

The wall of  the digestive tract contains 4 walls in addition to the submucosa

These are the muscularis  external ,(the external layers of muscles that contract s and relax  for propelling chime and chyle)

the mucosa

, and serous membrane. The mucous gland secrets Mucus for lubrication of the tubule.

the endoscopy is important for diagnosis and endoscopy therapy

it is also useful for identify the dept of tumor and other abnormalities.

is called echinoderms

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.