Melior Discovery neurophysiology
Proprioceptive Spinal Reflexes
The Hoffman (H) reflex is a proprioceptive spinal reflex produced by activation of Ia afferents originating in the plantar foot muscle that travel tot he spinal cord via the tibial nerve. Stimulation of the tibial n., which also contains plantar motor neuron efferents, first results in direct activation of the plantar muscle (M-response), followed by the reflex activation of the motoneurons and secondary muscle response (H-reflex). The ratio of H/M response amplitude has been used as a measure of spinal excitability.
Stimulation of the tibial nerve at the ankle results in a short-latency M-response in the plantar foot muscle followed by an H-response approximately 7 msec later.
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