Skin and Body membranes Flashcards
2 layers of cutaneous membranes
Epidermis & dermis
lines all body cavities that open to the exterior such as organs of respiratory, digestive, urinary (hollow)
Mucous membranes
covers the outside of the organs in the cavity
Visceral
lines abdominal cavity
peritoneum
membranes around the lungs
pleurae
allows organs to slide easily across the cavity walls without friction
serous fluid
membranes around the heart
pericardia
membranes that lines fibrous capsules surrounding joints :secretes fluid
Synovial membranes
composed of loose areolar connective tissue w no epithelial cells
Synovial membrane
these are secreted when we sweat
urea, salts, & water
anchors the skin to underlying organs & provides site for nutrient storage : adipose fat
subcutaneous or hypodermis
makes epidermis a tough protective layer
keratin
is epidermis vascular or avascular?
avascular
The multiple layers of EPIDERMIS:
stratum basale, granulosum, spinosum, lucidum & corneum
deepest layer of epidermis
Stratum basale
this is where nutrients diffused from dermis reach first
Stratum basale
this layer only occurs where skin is hairless & extra thick
Stratum lucidum
account for three quarters of the epidermal thickness ; outermost layer
Stratum corneum
dead stratum corneum :flaked and rubbed
dandruff
pigment changes ranges from yellow to black
Melanin
alert and activate immune system cells to a threat such as bacterial or viral invasion
epidermal dendritic cells
associated with sensory nerve endings ; touch receptors
Merkel cells
connective tissue making up the dermis
papillary layer & reticular layer
superficial dermal region
Papillary layer