ANAPHY Flashcards
Accessory structures of Skin
Hair and Nail
Both hair and nails are
modified forms of stratum corneum or keratinized tissue
It is a cylinder of compact keratinized material
Hair
It is a plate of compact keratinized material
Nail
H
Each hair is formed within a separate _________
Hair Follicle
A sheathlike indentation of the epidermis.
Hair Follicle
Found at the bottom of the follicle, covered with STRATUM GERMINATIVUM product of the hair
Hair Papilla
Portion of each hair within the follicle is called
Hair Root
Portion of hair that has ben pushed out of the follicle
Hair Shaft
The hair has a very _ and a _
The hair has a very DENSE CORTEX and a LESS DENSE MEDULLA
Attached to each follicle is an exocrine (ducted)
Sebaceous Gland
This gland produces the FATTY SUBSTANCE (SEBUM) that coats the hair and skin
Sebaceous Gland
This prevents moisture loss
Sebum
Conditions the hair and skin so that it doesn’t become brittle and easily broken
Sebum
This muscle is a strap of smooth muscle tissue connecting the side of a follicle to the suerficial surface of the dermis
Arrector Pili
When contracted, the muscle pulls the follicle so that it is nearly perpendicular to the skin’s surface.
Arrector pili
This increases the air spaces among the hairs, improving its insulation quality
Arrector Pili
Contraction of the arrector pili also
dimples the epidermis, raising a ridge at the edge of the follicle “goosepimple”
This is also formed by a modified portion of stratum germinativum
Toenail or Fingernail
In the case of either hair or nail, this MODIFIED TISSUE is often called
matrix
What produces the nail plate
Matrix
Skin under the nail
nail bed
Part of the matrix that is visbile through the nail is
pale crescent or lunula
Nail formation begins under a
fold of epidermis
the portion of the nail under a fold of epidermis is the
root
visible portion of the nail
nail body
may extend from the fold onto the nail body
cuticle
other term for cuticle
eponychium
found in many areas of the skin
sweat glands
exocrine glands that produces a watery solution, sweat, that coats the skin
sweat glands
primarily improves heat loss by the skin through evaporation
sweat
this sweat glands produce thin, watery sweat in many areas of the body
eccrine
this sweat glands is found in the axillary and pubic regions, secrete a thicker sweat that is rich in complex organic molecules
apocrine
