of the extensor and flexor muscles must be coordinated in the autogenic inhibition reflex. The Ib afferent branches in the spinal cord. One branch synapses the Ib inhibitory interneuron. The other branch synapses onto an excitatory interneuron. This excitatory interneuron innervates the alpha motor neuron that controls the antagonist muscle. When the agonist muscle is inhibited from contracting, the antagonist muscle contracts.

Excitatory interneurons mediating cutaneous inputs