Skin Flashcards
(133 cards)
How long and how heavy is the skin?
3000sq.inch. And 6 to 9 pounds.
Dorsal skin
is on the back of the hand or foot
volar skin
on the palm or sole of the foot
2 m a i n d i v i s i o n s of the skin
- Epidermis
- Dermis
Epidermis
is the outermost and thinnest
layer of the skin. It contains no blood vessels
but has many small nerve endings.
dermis
is the underlying or inner layer of
the skin. = derma= corium = cutis = true skin.
This highly sensitive layer of connective tissue
is about 25 times thicker than the epidermis.
Within its structure, there are numerous blood
vessels, lymph vessels, nerves, etc
Epidermis layer: Stratum germinativum = basal cell layer = living
layer of epidermis
- Responsible for the growth, new
cells of epidermis. - Has melanocytes (dark skin pigment
melanin
– skin color and protect deeper layer)
Epidermis layer: Stratum spinosum – spiny layer
when the process of
shedding begins
Epidermis layer: Stratum granulosum=granular layer
cell dying here
Epidermis layer: Stratum lucidum
clear, transparent layer just under
the skin surface. Through these cells the light can pass.
Epidermis layer Stratum corneum=horny layer
- we see this layer,
- scale like cells continually being shed and replaced
- protect and water-resist
Dermis layer: Papillary
(under the epidermis)
papillae (elastic tissue); some have looped
capillaries; some – tactile corpuscles.
Contains melanocytes
Dermis layer: Reticular
(supplies the skin with
oxygen and nutrients). Fat cells, sweat
glands, blood vessels, hair follicles, lymph
vessels, arrector pili muscles – goose
bumps, oil glands, nerve endings
Pheomelanin
(red to yellow)
Eumelanin
(dark brown to black)
Collagen
Fibrous protein that
gives the skin form
and strength.
(wrinkles)
Elastin
A protein gives the
skin flexibility and
elasticity (regain the
shape after stretching
or expanding)
Oil glands
sebaceous glands
Sweat glands
sudoriferous glands
UVA
deeper than visible light, tan
UVB
not so
deep, sunburns and vitamin D
Vitiligo skin condition
Irregular shaped patches of skin depigmentation(hands, face and neck)
Milia
White heads
epidermal cysts
Chloasma
Patchy brown skin discoloration, often resume if hormonal changes pregnancy