last set for chapter 12 . circuits

parallel after discharge circuit

a single presynaptic cell stimulates a group of neurons each of which synapses with a common postsynaptic cell.

neurogenesis

birth of new neurons from undifferentiated stem cells

plasticity

capability to change based on experience

wallerian degeneration

degeneration of the distal portion of the axon and myelin sheath

neural circuits

functional groups of neurons that process specific types of information

regeneration tubes

guides and stimulates regrowth of axons

diverging circuit

nerve impulses from a single presynaptic neuron causes the stimulation of increasing numbers of cell along the circuit

chromatolysis

nissl bodies breaking up into fine granular masses in response to injury of a peripheral neuron

divergency

permits one presynaptic neuron to influence several postsynaptic neurons at the same time

converging circuit

postsynaptic neuron receives nerve impulses from several different sources

simple series circuit

presynaptic neuron stimulates a single postsynaptic neuron

convergence

several presynaptic neurons synapse with a single postsynaptic neuron

reverberating circuit

stimulation of the presynaptic cell causes the postsynaptic cell to transmit a series of nerve impulses