Anterior proper fasciculus

The remaining fibers of the anterior funiculus constitute what is termed the anterior proper fasciculus (anterior basis bundle).

It consists of
 * (a) longitudinal intersegmental fibers which arise from cells in the gray substance, more especially from those of the medial group of the anterior column, and, after a longer or shorter course, reënter the gray substance;
 * (b) fibers which cross in the anterior white commissure from the gray substance of the opposite side.