Origin, course and termination of corticospinal fibers in a prosimian primate, Galago

This report describes the origin, course, and termination of cortical projections to the spinal cord in the bushbaby, Galago, Although the position and extent of these projections are similar to those reported in other primates, there is also (1) a somatotopic organization present in the motor-sensory cortex and in its projections to the spinal cord, and (2) additional nuclei in the medial base of the dorsal and ventral horn which receive afferents from the motor-sensory amalgam. This medial organization may be related to the innervation of axial musculature in Galago, an animal displaying a vertical clinging and leaping locomotive behavior.