| Term | Definition |
|---|
| pyramidal motorneuron (Golgi I) | located in the motor cortex |
| association neuron (Golgi II) | a neuron that only talks to other neurons; makes up 99.98% of the brain |
| sensory neuron | detects and transmits sensory signals into the brain |
| dendrites | branches extending from the soma that receive signals (=graded potentials (+) and (-)) from terminal branches of other neurons |
| axon | extension from soma that transmits/conducts the action potential |
| soma | the cell body |
| myelin sheath | fatty insulation around the axon, broken up by "naked" areas called nodes of Ranvier |
| action potential | (AP) "all or none" reversal of potential |
| input | first processing stage of a neuron; graded potentials: excitatory (Na+) and inhibitory (Cl-) |
| integrative | second processing stage of a neuron; summation of excitatory and inhibitory inputs at the axon hillock of a cell |
| conductive | third processing stage of a neuron; propogation of action potential along axon to terminal fibers "saltatory conduction" |
| output | fourth processing stage of a neuron; transmission of signal across synapse |
| trigger level | summation of EPSPs leading to depolarization and action potential (usually -60 MV) |
| resting membrane potential | summation of IPSPs leading to a hyperpolarized state (usually -70 MV) |
| EPSPs | positive graded potentials; accumulation of Na+ ions |
| IPSPs | negative graded potentials; accumulation of Cl- ions |
| voltage gated channels | a given voltage level is the key that opens the channel doors |
| trigger threshold | is the key for opening Na channels |
| positive values | key to opening K channels |
| lock and key model | ion channels are the doors that open; "chemically-gated channels |
| "key" | neurotransmitter molecules |
| "lock" | receptor sites on post-synaptic membrane |
Combine with other sets
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