uncrossed fibers forming a small bundle in the pyramidal tract. See: pyramidal tract. Syn: tractus corticospinalis anterior [NA], tractus pyramidalis anterior [NA], anterior corticospinal tract, anterior pyramidal fasciculus, direct pyramidal tract, fasciculus corticospinalis anterior, fasciculus pyramidalis anterior, Türck’s bundle, Türck’s column, Türck’s tract.