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.

Mucosa: The innermost tunic of the wall is known as the mucosa, or mucous membrane layer. The digestive tract's lumen is lined with it. The mucosa is made up of epithelium, a layer of lamina propria, a loose layer of connective tissue, and the muscularis mucosa, a thin layer of smooth muscle.

Submucosa: The mucosa is surrounded by a substantial layer of loose connective tissue known as the submucosa. Blood arteries, lymphatic vessels, and neurons are also present in this stratum. This layer might contain glands.

Muscular layer: An inner circular layer and an outside longitudinal layer make up the two layers of the smooth muscle that moves the digestive tract. The two muscle layers are separated by the myenteric plexus.

Serous layer or serosa: The adventitia is a connective tissue that makes up the digestive tract's outermost layer above the diaphragm. It is referred to as serosa below the diaphragm.

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