12. Describe the closed-loop model of an oscillatory network. How are inhibitory

Question

12. Describe the closed-loop model of an oscillatory network. How are inhibitory neurons involved? Could this be stimulating neurons, instead, to produce the rhythmic behavior? If there are three neurons in the loop, as shown on the right, describe how this can generate a rhythmic pattern of movement. If neuron #1 is stimulated first, what will be the order of neuron stimulation, in this model? (D) The closed-loop model of an oscillatory network 3 2 To flexor MN To extensor MN Three or more neurons are connected in a cyclic inhibitory loop.

Explanation / Answer

As it is inhibitory circuit,stimulation of neuron 1 will cause inhibition of neuron 3.that is less discharge to flexor motor neuron so inhibit flexion but at the same time the inhibition if neuron 3 will cause less inhibition to the neuron 2.indirectly less inhibition mean a positive stimulus so there will be an incrrased discharge to the extensor motor neuron.so simply what happens here all,flexion is inhibted and extension is promoted so it will lead to extionsion of limb.vice versa if there will be inhibition of neuron 1,by the same mechanism explained above there will be flexion if the limb as flexion is stimulated and extension is inhibited.the neuron 2 is also inhibiting the neuron 1 in the circuit for any excessiive discharge of impulses to avoid over stimulation.

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