CHP6 The Intugumentary System

soft vs hard keratinsoft soft pliable stratum

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

Ask a homework question - tutors are online