APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The epidermis functions as a physical barrier to the external environment and works to prevent loss of water from the skin.

Detailed explanation-2: -One of the body’s most important physical barriers is the skin barrier, which is composed of three layers of closely packed cells. The thin upper layer is called the epidermis. A second, thicker layer, called the dermis, contains hair follicles, sweat glands, nerves, and blood vessels.

Detailed explanation-3: -The lipid matrix in the outermost layer of the skin is crucial for the skin barrier function: cholesterol, free fatty acids and ceramides are important components of this lipid matrix.