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.

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