GENERAL HISTOLOGY

Detailed explanation-1: -The muscularis propria is comprised of a layer of circularly aligned muscle fibers within, and a layer of longitudinally aligned muscle fibers without, surrounding mucosal layers of loosely connected tissue. The muscle mass of the circular and longitudinal muscle layers is nearly the same.

Detailed explanation-2: -Answer and Explanation: Smooth muscle is the muscle type that is arranged in longitudinal and circular layers. Smooth muscle arranged in these layers can be found in different organs of the human body such as stomach, small and large intestines. Smooth muscle can also be found in blood vessels and the iris of the eye.

Detailed explanation-3: -The longitudinal muscle fibres run lengthwise along the body, and the circular fibres encircle it. The body contents are liquids or tissues that can be deformed into different shapes, but they maintain a constant volume.

Detailed explanation-4: -The muscularis, or muscularis externa, consists of an inner circular muscular layer and a longitudinal outer muscular layer. The coordinated contractions of these layers is called peristalsis, which propels the food through the GI tract.