Exam 4 Part 3 Accessory organs Flashcards
Hair & the hair follicle: reside in the _____ & ________ ____, but originate from the _______ tissue
Dermis ; subcutaneous layer ; epidermal tissue
Tube like structure which protrudes down into the dermis, houses an individual hair
Follicle
Zone of actively dividing cells at the base of the hair
Bulb
Column of flattened, dead keratinized cells w/in the follicle
Root
Column of flattened, dead keratinized cells external to the skin’s surface
Shaft
Hair root & shaft are made up of ______ (inner core), ______ (middle section) & _______ (outer portion)
Medulla
cortex
cuticle
What muscles cause your hair to stand on end “goose bumps”
Arrector pili muscle
Arrector pili muscle is made up of
Smooth muscle
Arrector pili muscle is attached to the hair _____ surface & to the ____
Follicle; dermis
Melanocytes are located in the ___ of the hair
Base
HIGH concentration of melanin
Dark hair
Moderate amount of melanin
Light drown hair
Little melanin
Blond hair
NO melanin
White hair
Mixture of pigmented & un-pigmented hairs =
Grey hair
Hair color containing iron?
Red hair
What determines the texture of hair?
Shape & size of follicle
What are the functions of hair?
Protection
Identification
Geographically what population has the highest amount of body hair?
European descent
Geographically what population has the least amount of body hair?
East Asians & Amerindians
Modified hardened stratum corneum; divisible into nail root, nail body, & free edge
Nail plate
Underlying the nail plate; continuous with stratum basale & stratum spinosum of surrounding epidermis
Nail bed
Part of the nail plate; light half-moon region at the proximal end of the nail plate, due to extreme thickness of underlying nail bed
Lunula
Function of nails
Protection
facilitation of digital dexterity
