CHP6 The Intugumentary System

soft vs hard keratinsoft soft pliable stratum

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Unformatted text preview: produce Psychological and social functions= appearance & appearance social acceptance social • Facial expression and nonverbal communication Nail, hair, & cutaneous= accessory organs Nail, accessory (appendages) (appendages) HAIR= known as pilus, a slender filament of keratinized known pilus slender cells that grow w/in a follicle follicle Human Hair Human Hair (cont.)• Soft -vs- hard keratinSoft • Soft= pliable stratum corneum of skin • Hard= compact, tougheded keratin of hair & nails • Hair present almost everywhere on the body • Differences btw sexes or individuals is really difference in texture & color of hair 3 different body hair types• Lanugo= fine, unpigmented fetal hair • Vellus= fine, unpigmented hair of children & women; 1/10 of fine, men hair men • Terminal hair= coarse, long, pigmented hair of scalp, coarse, eyebrows, eyelashes eyebrows, • Vellus hair changes to terminal after puberty Hair structure Hair Hair has 3 zones= bulb, root, & shaft • • • • Bulb= swelling @ base where hair originates in dermis Root= remainder of hair w/in follicle Shaft= portion above skin surface Papilla= small amount of vascular tissue that grows into bulb • Provides hair w/ nutrients Provides In cross section, 3 layers: medulla, cortex & cuticle In • Medulla= core of loosely arranged core cells & air space cells • Cortex= densely packed keratinized densely cells cells • Cuticle= single layer of overlapping singl...
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