Physiology

An idea of the discreteness of the efferent control via the cortex is given by the evidence reported by Chang, Ruch and Ward, who with fixed routine of stimulation were able to delimit cortical areas controlling separately a single muscle operating at the ankle of the monkey, or even single parts of a muscle. Although it is clear from the work of Sherrington himself on the instability of motor points on the cortex that no entirely rigid anatomic pathway is responsible for these results, it is equally clear that out of a combination of anatomic pathway and stimulation characteristics a . . .