5-neuroal Pools Flashcards
Define neuronal pools ?
Collection of neurons with common input , output & function
organization of neurons in neuronal pools ? (4)
- convergence
- divergence
- lateral reciprocal inhibition
- after discharge
Convergence is ?
many input converge to one neuron
Convergence as (example ) ?
Convergence along sensory pathways
Divergence is ?
input divide into many branches which synapses with many neurons
excitation of single input = stimulation of multiple outputs
Divergence as (example) ?
Single pyramidal tract
lateral (reciprocal inhibition ) is ?
nerve give collateral fibres to excite inhibitory neurons to inhibit surrounding neurons
lateral (reciprocal inhibition ) significance ? (2)
1) inc sharpness of sensation by Dec lateral spread of stimuli
2) reciprocal inhibition ( contraction of certain muscles & relaxes other muscles )
lateral (reciprocal inhibition ) as (example )?
Renshaw cell inhibition
After discharge is ?
continues discharge of output after stoppage of stimuli of input
After discharge has 3 mechanisms ?
1- synaptic after discharge
2- parallel circuits
3- reverberating
parallel circuits is ?
input connected to output by several pathways each pathway has different number of inter-neurons
Reverberating circuits : interneuron sends axon to————- & give collateral branch that return—————— its own cell body either————or———-?
output, excite.
direct or through interneuron
Reverberating is ?
input excites output an interneuron which in turn excites the output
Reverberating Circuit continues until inhibited by ?
- fatigue - external factors
