41. T.S. Medulla -Pyramidal Decussation
shows the crucial crossing (decussation) of most corticospinal motor fibers, forming the lateral corticospinal tract, while dorsal sensory nuclei (gracile and cuneate) are prominent posteriorly, with internal arcuate fibers from them beginning to form the medial lemniscus, marking the transition from brainstem to spinal cord.