Classification of hair

Classification of hair - Integumentary System...

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Integumentary System * Classification of hair * Hairs that are long and fine and formed in the fetus at 20 weeks of birth are referred to as Lanugo hairs . These are normally shed before birth, but may remain on premature babies. * Vellus hairs cover most of the surface area of our bodies and are colorful, short and fine. At puberty, the Vellus hairs are stimulated by androgens to form Terminal hairs. * Terminal hairs are the longer, darker, thicker hairs found on the eyebrows, eyelashes, scalp, pubic and axillary regions. * Hirsutism - excessive and undesirable hairiness in areas that are not usually hairy, especially in women and children * Vibrisse (guard hair)- guard the nostrils, ear canals and eyes to prevent foreign particles from entering easily. * The hair shaft is composed of an outer cuticle which encompasses a cortex of keratinocytes . * In terminal hairs, the cortex contains an inner medulla . * The hair bulb contains germinative cells which can be associated with melanocytes which produce pigment. * Hair becomes erect, forming "goose bumps" when the
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Classification of hair - Integumentary System...

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