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33 Cards in this Set

  • Front
  • Back
list the 5 layers of the epidermis and describe each
a. stratum basal - lowest layer, single layer of cells, mitotically active, contains keratinocytes, melanocytes, Merkel cells
b. stratum spinosum - 8-10 cell layers thick, contain keratinocytes, Langerhans cells
c. stratum granulosum - 3-5 cell layers thick, cells begin to flatten due to heavy keratin, produce glycolipid
d. stratum lucidum - (only in thick skin) 3-4 cell layers thick, transparent, cells nearly dead
e. stratum corneum - 25-30 cell layers thick, cells dead
Papillary layer of dermis
immediately deep to the epidermis, composed of areolar CT, contain Meissner's corpuscles and dermal papillae
dermal papilla
bumpy, peglike projections from the dermis into the epidermis, often containing capillary loops, Meissner's corpuscles, or pain receptors
reticular layer
deep layer of dermis composed of dense irregular CT and adipose, contains Pacinian corpuscles and epidermal derivatives such as hair follicles, sebaceous glands, and sudoriferous glands
arrector pili muscle
muscle that moves hair folicles erect
name the three parts of hair
shaft, bulb, root
Meissner's corpuscle
fine touch receptor found in the papillary region of dermis
Pacinian corpuscle
deep presure nerve endings found in the reticular region of the dermis
sebaceous glands
epidermal derivatives that produce oil
a. eccrine sudoriferous glands
b. appocrine sudoriferous glands
a. sweat glands on palms, soles, forehead,
b. sweat glands in axillary and anogenital regions
deep to the dermis, not considered part of the skin
list epidermal derivatives and state functions of each
a. hair follicles grow hair
b. sebaceous glands produce oil that lubricates and protects hair
c. sudoriferous glands produce sweat, cooling and eliminating some wastes
what is the mechanism and purpose of tanning?
tanning is caused by exposure to UV radiation, which causes increased production of melanin by melanocytes and spreading of melanin by keranocytes. Its purpose is to protect the skin from the effects of UV radiation
cell body
aka soma. contains nucleus and most organelles.
functions in cytoskeletal support and intracellular transport
neuron processes that are receptive regions
neuron processes that act as nerve impulse generators and transmitters (only 1 per neuron)
axon terminals
end of axon that stores neurotransmitter chemicals
schwann cells
cells that form myelin sheath in PN
sheath of Schwann cell, covers myelin sheath
myelin sheath
sheath made of Schwann cells that covers axon and increases transmittion speed along axon
node of Ranvier
spaces between Schwann cells in myelin sheath
shallow grooves in the brain
elevated ridge in the brain
deep grooves in the brain
Longitudinal fissure
deep fissure dividing the brain into two hemispheres
Central sulcus
windy groove running from longitudinal fissure about halfway down; divides anterior and posterior
Lateral sulcus
groove running posterior of orbital region to about halfway back
Precentral gyrus
ridge anterior to central sulcus. primary motor area
Postcentral gyrus
rudge posterior to central sulcus.
primary somatosensory cortex
nissl body
elaborate rough ER in the cell body
describe endocrine glands and give examples
glands that secrete products, mostly hormones, into blood.
exocrine glands
secrete products out of epithelium. include sweat and oil glands.