Page 1 of 1: physiology - tough one

pratik · Credits: 11374 My Scrapbook

what type of neuronal circuit is typified by the nervous control of muscular activity

a diverging circuit
b converging circuit
c integrative circuit
d parallel circuit

answer given is diverging circuit

please explain

guest · Credits: 78825 My Scrapbook My Reading List 262569 Books

NEURONAL CIRCUITS-patterns of connections between neurons in the CNS

1. Simple series circuit- 1 presynaptic neuron synapses with 1 post synaptic neuron. This is simplest and easiest to understand, but it is not the most common type. (Usually things are more complecated.)

2. Diverging circuit (divergence)- a single presynaptic neuron may synapse with several postsynaptic neurons. This is called divergence and tends to cause stimulation of increasing numbers of neurons along the circuit, making widespread efefects likely.

3. Converging circuit (convergence)- a single postsynaptic neuron synapses with several presynaptic neurons. This permits more effective stimulation or inhibition of the postsynaptic neuron.

4. Reverbrating (oscillatory) circuit- once the circuit is stimulated, the impulse runs around and around the circuit, maybe even for hours. Coordinating muscle activities, waking and sleeping, short-term memory, breathing.

5. Parallel after-discharge circuits- single presynaptic neuron stimulated a group of postsynaptic neurons (divergence) but then all the postsynaptics synapse with a common neuron.

A single upper motor neuron supplies many lower motor neurons through interneurons and every lower motor neuron supplies so many motor units through motor nerve. Therefore if one CNS cell "decides" to move your leg; it sends impulses to lots of spinal nerves causing several hip/leg muscles to contract. So it is diverging circuit.

lazybonezzz · Credits: 54705 My Scrapbook

I AGREE

naseem · Credits: 1447 My Scrapbook

yes it is diverging circuit.

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