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Integumentary Terms 2/3

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Terms in this set (24)

  • Blister

    A fluid-filled pocket between the epidermis and dermis caused by friction or injury.

  • Lanugo

    Fine, soft, unpigmented hair that covers the fetus and is usually shed before birth.

  • Vellus hair

    Short, fine, pale hair found on most of the body surface after lanugo is shed.

  • Terminal hair

    Thick, long, pigmented hair found on the scalp, eyebrows, and after puberty in certain areas.

  • Hair follicle

    A tubular invagination of the epidermis that surrounds the hair root and anchors the hair into the skin.

  • Hair shaft

    The visible part of the hair that extends above the skin surface.

  • Hair root

    The portion of the hair below the surface of the skin, embedded within the follicle.

  • Hair bulb

    The rounded, deepest part of the hair root where hair growth begins.

  • Matrix (hair)

    The region of actively dividing cells in the hair bulb responsible for hair growth.

  • Medulla (hair)

    The central core of the hair shaft, often containing soft keratin and air spaces.

  • Cortex (hair)

    The thick layer surrounding the medulla, containing densely packed keratin and pigment.

  • Cuticle (hair)

    The outermost layer of the hair shaft made of overlapping dead cells that protect the hair.

  • Arrector pili

    A small muscle attached to hair follicles that contracts to cause hair to stand (goosebumps).

  • Eponychium

    The cuticle; a narrow band of epidermis at the base of the nail plate protecting the nail root.

  • Nail plate

    The hard, visible part of the nail made of keratinized cells.

  • Lunula

    The crescent-shaped whitish area at the base of the nail plate, visible part of the nail matrix.

  • Sudoriferous gland

    A sweat gland that produces sweat to help regulate body temperature and excrete waste.

  • Sebaceous gland

    An oil gland that secretes sebum to lubricate and waterproof the skin and hair.

  • Eccrine sweat gland

    A type of sweat gland that produces watery sweat for thermoregulation, found all over the body.

  • Apocrine sweat gland

    A sweat gland found in specific areas (armpits, groin) that produces thicker sweat, often odoriferous.

  • Ceruminous gland

    A modified apocrine gland in the ear canal that produces cerumen (earwax).

  • Mammary gland

    A specialized sweat gland in the breasts that produces milk.

  • Acne

    An inflammatory condition of sebaceous glands characterized by pimples, blackheads, and cysts.

  • Melanin

    A pigment produced by melanocytes that gives skin, hair, and eyes their color and protects against UV radiation.