APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The outer layer of the skin has cells that contain the pigment melanin. Melanin protects skin from the sun’s ultraviolet rays. These can burn the skin and reduce its elasticity, leading to premature aging. People tan because sunlight causes the skin to produce more melanin and darken.

Detailed explanation-2: -The photoprotective properties of human epidermal melanin in skin have been well documented (Kollias et al, 1991). It absorbs both ultraviolet (UV) and visible light. The absorption increases linearly in the range of 720 to 620 nm and then exponentially toward shorter wavelengths (300–600 nm).