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24 Cards in this Set
- Front
- Back
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deep fascia |
deep layers of connective tissue enclosing and separating muscles and encircling nerves and blood vessels |
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dermal hair papilla |
a one of connective tissue that extends into the interior of the hair bulb to provide blood supply to the internal growth regions |
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dermis |
the layer of the skin deep to the epidermis
it contains the hair roots and the secretory portions of sebaceous and sweat glands, as well as loose connective tissue, blood vessels, sensory organs, and nerves |
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epidermis
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the epithelial layer of the skin
consists of multiple layers, which are generated by cell division in the deepest layer and become progressively more flattened as they approach the surface |
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free nerve ending
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a naked nerve ending in the epidermis of the skin; responds to light pressure, touch, and itch
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glands
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clusters of epithelial cells which produce secretions
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hair
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a flexible shaft of keratin which has a hair follicle embedded in the dermis and a shaft protecting from the surface of the scalp or skin; slows air movement across the skin, thereby conserving body heat
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hair bulb
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the part of the hair enclosed in the hair follicle; contains a growth zone that produces the sheath cells to make a tough protein called keratin, and melanocytes to produce pigment
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hair follicle
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the bulbous part of the hair embedded in the dermis; it is an epithelial structure responsible for the growth of the hair and includes the hair bulb, and external and internal root sheaths
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hair shaft
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the long part of the hair consisting of a hard protein called keratin; comprises three concentric layers: cuticle, cortex, and medulla
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stratum corneum (horny layer)
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the water-resistant outermost layer of the epidermis; cells in this layer are dead and completely filled with keratin, hence the cornfield or horny appearance
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Krause bulb
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small bulbous enlargements of nerve endings; they are found in the mucous membranes of the mouth and the genital region and are sensitive to low-frequency vibration
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Meissner corpuscles
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sensory receptors in the upper dermis; responsible for the perception of light touch and are concentrated in the digit pads, soles, palms, face, and tongue
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nerve endings
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free sensory nerve endings in contact with the hair follicles; stimulated by hair movement
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Pacinian corpuscle
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a laminated sensory organ in the dermis of the skin; sensitive to vibration and is important for the perception of tactile texture
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pore
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the opening of a sweat gland duct at the sin surface; in hairless skin, pores open on the ridges of fingerprints
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Ruffini endings
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sensory organs sensitive to stretch; found in hairless skin
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sebaceous gland
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a gland which produces fatty secretions to enhance the water retention of the skin and protect against microorganisms; attached to hair roots
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skin
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the surface organ of the body, it comprises a superficial epidermal layer and a deep dermal layer, and may be hairy or smooth (glabrous)
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stratified squamous skin cells
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the epithelial cells of the skin are stratified, squamous epithelial tissue with the ability to produce the tough protein called keratin
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stratum granulosum
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this layer of the epidermis consists of stacks of flattened skin cells filled with granules of a protein called keratohyalin
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stratum spinosum
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the layer of the epidermis immediately superficial to the lowest level where epidermal cells are generated by mitosis; cells in the stratum spinosum have a polygonal shape
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subcutaneous fat
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fat lying beneath the dermis of the skin; also known as the hypodermis
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sweat gland
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there are two types: eccrine glands (produce a watery secretion with mineral salt, sodium chloride) for thermoregulation and apocrine (produce a slightly fatty secretion in the genital region, axilla, and external ear)
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