PATHOLOGY

Detailed explanation-1: -In the GI tract, the muscularis propria contains smooth muscle cells organized into a tightly coiled, inner circular layer and outer longitudinal layer, as shown in Figure 1. The smooth muscle cells are arranged in parallel arrays.

Detailed explanation-2: -In the stomach, muscularis mucosa is composed of two thin layers of smooth muscles arranged as inner circular and outer longitudinal layer. The muscularis externa is three layered thick as outer longitudinal, middle circular and inner oblique layer and are oriented more randomly than layered [2].

Detailed explanation-3: -Muscularis propria (externa): smooth muscle layer. There are usually two layers; the inner layer is circular, and the outer layer is longitudinal. These layers of smooth muscle are used for peristalsis (rhythmic waves of contraction), to move food down through the gut.

Detailed explanation-4: -The muscularis externa of the small intestine consists of smooth muscle fibers arranged into an inner circular layer and an outer longitudinal layer. Between these two muscle layers is a network of unmyelinated nerve fibers and parasympathetic ganglia called Auerbach’s plexus (or myenteric plexus).