The study demonstrates that the pyramidal tract mediates primary afferent depolarization evoked by sensorimotor cortex stimulation via spinal reflex arc interneurons.
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May guide models of cortical control over spinal reflexes in animals; leaves open translation to human sensorimotor function.
Stimulation of the sensorimotor cortex evokes dorsal root potentials (DRP) in the lumbo‐sacral cord. Primary afferent depolarization is evoked in group Ib and group II muscle af‐ferents and cutaneous afferents but not in Ia afferents. The effects are mediated by the pyramidal tract. There is spatial facilitation between the paths from primary afferents and cortex. It is concluded that the pyramidal tract acts on primary afferents by giving excitatory action to interneurones of spinal reflex arcs to primary afferents.
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Carpenter et al. (1963) studied this question.
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