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List and briefly describe each accessory organ of the skin.?

Tags: list, accessory organ of the skin
Asked by teja, 01 Oct '07 08:55 am
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Answers (1)


The following accessory organs (skin derivatives) are embedded in the skin:

Hairs are elongated filaments of keratinized epithelial cells that arise and emerge from the skin of mammals. Hair is composed of the following structures:

The hair shaft is the portion of the hair that is visible on the surface of the skin.

The hair root is the portion of the hair that penetrates the skin (epidermis and dermis).

The hair follicle is the sheath that surrounds the hair in the skin.

The bulb is the base of the hair follicle.

The matrix is the bottom of the hair follicle (located within the bulb). Here, cells are actively dividing, producing new hair cells. As these cells differentiate, they produce keratin and absorb melanin from nearby melanocytes. As younger cells are produced below them, the more mature cells are pushed upward, where they eventually die. The keratin they leave behind contributes to the growth of the hair. The color of the hair is determined by the pigments a ...more
Answered by SWEETY, 01 Oct '07 09:26 am

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