Clarke's column (nucleus dorsalis), the source of unconscious proprioceptive input to the cerebellum, extends through which segments of the spinal cord?
- A C1 to C8
- B T1 to S2
- C C8 to L3 ✓
- D L1 to S3
Correct answer: C. C8 to L3
Explanation
Clarke's column occupies the medial base of the dorsal horn from approximately B8 to L3. Fibres entering above or below this extent travel in the fasciculi gracilis and cuneatus to reach it, which explains why the dorsal spinocerebellar tract is absent below L3 and why the caudal equivalent runs in the fasciculus gracilis. Proprioception from the leg therefore relays through this thoracolumbar column.
Reference: Gray's Anatomy for Students, 4th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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