GENERAL HISTOLOGY

Detailed explanation-1: -The lamina propria is a thin layer of loose (areolar) connective tissue, which lies beneath the epithelium, and together with the epithelium and basement membrane constitutes the mucosa.

Detailed explanation-2: -The lamina propria is composed of noncellular connective tissue elements, i.e., collagen and elastin, blood and lymphatic vessels, and myofibroblasts supporting villi. However, the main characteristic of the lamina propria is to contain numerous immunologically competent cells as well as nerve endings.

Detailed explanation-3: -Loose connective tissue (areolar) is located directly beneath the epidermis of the skin. Dense irregular connective tissue forms most of the dermis below the loose connective tissue. Dense irregular connective tissue has similar components as loose connective tissue.

Detailed explanation-4: -The mucosa, or mucous membrane layer, is the innermost tunic of the wall. It lines the lumen of the digestive tract. The mucosa consists of epithelium, an underlying loose connective tissue layer called lamina propria, and a thin layer of smooth muscle called the muscularis mucosa.

Detailed explanation-5: -Areolar connective tissue is found across the body, specifically under the epithelial cell layer of organ systems with external openings, like the digestive tract, respiratory system, and under the dermis of the skin.