[Innervation of the medial group of plantar muscles in man (electrophysiologic study)].

The central response of the medical group of muscles in the foot sole, as a reaction to a stimulation of the tibial nerve has an antidrome character in normals over 20-22 years of age. However, in children and adolescents, as well as in disturbance of the supra-segmental control in this sort of response is a prevalent reflectory (monosynaptical) component. A similar trait was found in patients with discogenic radiculitis in an isolated lesion of the L5 radicle. And on the contrary, a pathology of the S1 radicle not only did not change the antidrome character of the response, but prevented the dominance of the reflectory component in cases of an accompanying lesion of the descending spinal conductors or L5 radical. The conclusion is made that the innervation of the protuberant muscles of the 1 finger in the human foot is accomplished by the L-motoneurons of the anterior horns of the S1 segment.