Final answer:
The submucosal plexus, also known as the plexus of Meissner, is responsible for innervating the muscularis mucosae of the small and large intestines.
Step-by-step explanation:
The submucosal or plexus of Meissner innervates the muscularis mucosae of the small and large intestine. The submucosal plexus is an essential component of the enteric nervous system, which provides intrinsic innervation to much of the alimentary canal; it regulates digestive secretions and reacts to the presence of food. Lying in the submucosal layer, this plexus plays a crucial role in controlling the function of the digestive tract. The muscularis mucosae, a thin layer of smooth muscle, aids in pulling the mucosa into folds to increase the surface area for digestion and absorption.