Spinal tracts: simplified geography
2 posterior: cross at the medulla.
2 lateral: ipsilateral (same side).
2 anterior: cross at the spinal level.
Note 1: Descending tracts on left of figure, ascending tracts on right.
Note 2: For ipsilaterals: one never crosses, one crosses at the level then doubles back farther up. The
ipsilateral that crosses at the level (ventral spinocerebellar) is the ipsilateral closest to the 2 anterior ones,
which also cross at the level.
Tract names in each group:
Posterior 2: lateral corticalspinal, dorsal columns. Lateral 2: dorsal spinocerebellar, ventral spinocerebellar. Anterior 2: ventral corticospinal,