PYRAMIDAL TRACT. Pyramidal tract major pathway : the corticospinal tract. The pyramidal tract is a set of motor neurons regulating the precise voluntary movements. Those motor neurons originate in the motor cortex of the encephalon mainly at the level of the precentral gyrus, that is to say from the primary motor cortex, but also the postcentral gyrus and pre_motor cortex. Each skeletal muscle of the body is represented by a precise area of the motor cortex. Thoses neurons descending vertically