corticospinal tract Definition

any of four columns of motor fibers of which two run on each side of the spinal cord and which are continuations of the pyramids of the medulla oblongata : pyramidal tract:

lateral corticospinal tract

ventral corticospinal tract

ventral corticospinal tract

a band of nerve fibers that descends in the lateral funiculus of the spinal cord and consists mostly of fibers arising in the motor cortex of the contralateral side of the brain and crossing over in the decussation of pyramids with some fibers arising in the motor cortex of the same side —called also crossed pyramidal tract

a band of nerve fibers that descends in the ventrolateral part of the spinal cord and consists of fibers arising in the motor cortex of the brain on the same side of the body and not crossing over in the pyramidal decussation —called also anterior corticospinal tract, direct pyramidal tract