MICROANATOMY

Detailed explanation-1: -The muscularis consists of smooth muscles arranged in an inner circular and outer longitudinal layer. The transverse muscles form only the innermost layer in the abdominal region. Muscularis is responsible for peristalsis and digestion of food with juices.

Detailed explanation-2: -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-3: -The outermost layer is the serosa, which is continuous with the mesentery (tissues connecting the intestines to the abdominal wall). It contains blood vessels and nerves, and it secretes fluid to lubricate the small intestine, protecting it from damage due to friction.