THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Above the diaphragm, the outermost layer of the digestive tract is a connective tissue called adventitia. Below the diaphragm, it is called serosa.

Detailed explanation-2: -Serosa is the outermost layer and is made up of a thin mesothelium and connective tissue. Muscularis is formed by smooth muscles usually arranged into an inner circular and an outer longitudinal layer. Sub-mucosa layer is formed of loose connective tissues containing nerves, blood and lymph vessels.

Detailed explanation-3: -The outermost layer serosa is absent in the oesophagus. The submucosa of the intestine have glands like the Brunner’s gland. The mucosa is made up of epithelium.

Detailed explanation-4: -Serous membranes have two layers. The parietal layers of the membranes line the walls of the body cavity (pariet-refers to a cavity wall). The visceral layer of the membrane covers the organs (the viscera). Between the parietal and visceral layers is a very thin, fluid-filled serous space, or cavity.