Chapter 5 Powepoints cont Flashcards
Subcutaneous tissue
Deep to skin Consists of loose connective tissue with collagen and elastic fibers Types of cells Fibroblasts Adipose cells Macrophages
what is the subcutaneous tissue also called?
Hypodermis
Superficial fascia
what are the functions of subcutaneous tissue?
Contains about one-half of body’s adipose tissue. Functions as
Energy source
Insulation
Padding
Cleavage (tension) lines
elastic and collagen fibers oriented in some directions more than in others
why are cleavage (tension) lines important?
Important in surgery
If incision parallel to lines, there is less gapping
faster healing, less scar tissue
striae (stretch marks) occur
(stretch marks) occur
If skin is o v e r s t r e t c h e d
what are the 3 concentric layers of hair?
Medulla: Central axis
Cortex: surrounds medulla and forms bulk of hair
Cuticle: Forms hair surface
how is the hair divided
shaft, bulb, root
root and shaft are composed of
columns of dead keratinized epithelial cells in three layers
hair follicle
tubelike invagination of the epidermis that extends to the dermis
hair matrix
produces hair and the internal epithelial root sheath
growth stage of hair
new matrix calls are produces, differentiate, become keratinized, and die.
hair grows longer as cells are added at the base of the hair root
arrector pili
smooth mucle cells
sabaceous glands produce
sebum, an oily white substance that is rich in lipids
eecrine sweat glands
most common type of sweat glands merocrine tubular, coiled, simple glands that open to the surface palms, soles regulate temp
apocrine sweat glands
simple, coiled, tubular glands that usually open into hair follicles superficial to the opening of the sabaceous glands
found in axillae or genetalia
active during puberty
sexual maturity for animals
ceruminous glands
located in the ear canal
cerumen
earwax, composed of the combines secretions og the ceruminous glands and sabaceous glands
nail
is a plate with layers of stratum corneum cells that contain hard keratin
nail root and body
- root is covered by skin and extends matrix
- body is visible
Eponychium
cuticle- is corneum superficial to nail body, hyponychium is corneum beneath the free edge
hyponichyium
is corneum beneath the free edge
Matrix and nail bed
cells that give rise to the nail
composed of epithelial tissue, with a stratum basale
lanula
blood vessels dont show trough the thicker nail matrix
how fast do nails grow
Grow continuously unlike hair
Fingernails grow 0.5-1.2 mm/day;
faster than toenails
lipids in the intergumarty system
have to be applied directly bc lipids dont make it through epithelial tissure
integumarty system temp regulator
sweat to vevapotate to cool body off
arrector pilli for shivering when cold
first degree burn
second degree burn
only the epidermis, redness pain
epidermis and dermis- blisters 2 weeks to heal
third degree burn
usually painless bc sensory receptors are destoryed
completely destroy the dermis and epidermis
appear white, tan, brown, black or deep cheery red
