The ventral (anterior) spinocerebellar tract reaches the ipsilateral cerebellar hemisphere by virtue of which anatomical arrangement?

• A It remains uncrossed throughout its course
• B It crosses once, in the anterior white commissure
• C It crosses twice, first in the spinal cord and again in the superior cerebellar peduncle ✓
• D It crosses twice, in the anterior white commissure and the inferior cerebellar peduncle

Explanation

Ventral spinocerebellar fibres arise from spinal border cells of the lumbar enlargement, cross in the anterior white commissure, ascend in the contralateral lateral funiculus, and then recross in the superior cerebellar peduncle before entering the vermis and paravermal cortex. This double crossing returns the information to the same side it originated from. The dorsal spinocerebellar tract, by contrast, never decussates and enters through the inferior peduncle.

Reference: Gray's Anatomy for Students, 4th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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