macro and micro overview of the NS Flashcards
what are the subdivisions of the NS
CNS (central nervous system)
PNS (peripheral nervous system)
what are the components of the NS
brain, spinal cord, nerves, sensory receptors
what are the parts of the CNS
brain and spinal cord
what are the subdivisions of the PNS
sensory receptors and nerves
what are the cells of the nervous system?
neurons or nerve cells
what do neurons “do”
receive stimuli and transmit AP
what are the 3 organizational parts of the neurons?
cell body or soma
dendrites
axons
what is the fn of the dendrites
receive input
what is the fn of the axons
provide output
what are the parts of the neural soma?
nucleus
nissl bodies
axoplasm
what is the fn of the nissl bodies?
rough ER site of protein production
describe the structure and fn of dendrites?
short, often highly branched
increase surface area of soma
receive input
what is the structure of an axon?
can be branched
what are the parts of an axon?
axon hillock axoplasm - cytoplasm axolemma - cell membrane presynaptic terminals synaptic vessicles
what is the axon hillock?
the part between the soma and axon where inhibitory and excitatory potentials are summated until they reach threshold, then an AP is propagated down the axon
