integumentary system Flashcards
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Basal layer
Deepest layer of the epidermis. Is composed if living cells where new cella are formed.
Stratum corneum
Is composed of dead flat cells that lack a blood supply and sensory receptors.
Ductule
Very small duct.
Keratin
As new cells move toward the stratum corneum to replace the cells that have been sloughed off, they die and become filled with a hard protein material called keratin. Relatively waterproof, prevents body fluids from evaporating and moisture from entering the body
Melanin
Provides a protective barrier from the damaging effects of the sun’s ultraviolet radiation. Melanocytes produce the black pigments.
Sebaceous
Oil glands mostly in hair follicles
Sudoriferous
Sweat glands. Located in the dermis. Secrete perspiration onto the surface of the skin through the pores.
Exocrine glands
They secrete substances through ducts to an outer surface of the body rather that directly into the bloodstream like endocrine glands
Axillae
Armpits
Hair shaft
The visible part of the hair
Hair follicle
The coverings of the root
Papilla
At the bottom of the follicle is a loop of capillaries enclosed.
Alopecia
(Baldness) occurs when the hairs of the scalp are not replaced because of death of the papillae.
Nail root
Is composed of keratinized stratified squamous epithelial cells producing a very tough covering.
Nail bed
As the nail grows, it stays attached and slides forward over the layer of epithelium called the nail bed.
Lunula
The half moon shaped area at the base of the nail.
Lip/o
Lipocele- hernia containing fat
Steat/o
Skin
Ex. Steatitis- inflammation of fatty(adipose) tissue