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Hair & Nail

Hair & Nail

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Hair & Nail

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  1. Hair & Nail Integumentary System

  2. Hair Hair root – a knot of sensory nerve endings which wraps around each hair bulb Hair shaft – part of the hair that projects outside the skin; made mostly of keratin (tough protein produced by kerat Hair bulb matrix – actively dividing germinal layer

  3. Hair Follicle Epidermal sheath – composed of epithelial cells; inner layer of follicle Dermal sheath – composed of connective tissue; outer layer of follicle Connective tissue papilla – protrudes from dermal sheath; provides nutrition

  4. Hair • Melanocytes – cells that produce melanin (pigment responsible for skin & hair color) • Arrectorpili– smooth muscle which connects the hair follicle to the dermis • Responsible for “goose bumps”

  5. http://www.bienetrespa.com/skin-care-101/arrector-pili-muscleshttp://www.bienetrespa.com/skin-care-101/arrector-pili-muscles

  6. Parts of Hair Shaft Cuticle – outer most layer Cortex – middle layer Medulla – innermost layer

  7. Damaged cuticle Normal cuticle http://todaystresses.com/info/what-is-remy-hair

  8. Nail Free edge - visible unattached portion Body – visible attached portion Root – embedded in the skin; adhered to nail bed Nail fold – skin that overlaps the nail (lateral and proximal) Nail bed – composed of epithelial tissue

  9. Nail • Nail matrix – thickened proximal part of the nail bed responsible for nail growth • Lunula– visible part of nail matrix • Cuticle or eponychium – next to proximal nail fold