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Hair
Last reviewed: 23.04.2024
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Hair (pili) covers in varying degrees all the skin (except for the palms, soles, the transitional part of the lips, the glans penis, the inner surface of the prepuce, small labia). Hair, like nails, is a derivative of the epidermis. They have a rod protruding above the surface, skin, and root. The root is in the thickness of the skin, ending with an extension - the bulb of the hair (bulbus pili) - the germ of the hair.
The root (radix) of the hair is located in the connective tissue bag, which opens the sebaceous gland. In this bag of hair weave a muscle lifting the hair (m. Errector pili). This muscle begins in the deep layers of the mesh layer of the dermis. With contraction of the muscle, the hair straightens, the sebaceous gland squeezes and secretes its secret. The fetal body is covered with fluff, which after birth is replaced by a secondary scalp.
Long (bristly) hair grows on the head, eyebrows, edges of the eyelids. During puberty, the hairline appears in the armpits, on the pubic area. Men have a beard and a mustache. Hair color depends on the presence of pigment. When hair bubbles appear in the thickness of the hair and the pigment disappears, the hair turns gray.
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