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posterior (dorsal) column

White matter tract medial to the dorsal horns consisting of axons that relay somatic sensory information to the medulla. This tract includes the fasciculus gracilis & the fasciculus cuneatus, spinal cord columns transmitting proprioception, stereognosis & vibratory sensation ipsilaterally to medullary nuclei (nucleus gracilis & nucleus cuneatus, respectively) before crossing over. Pathology: - the posterior columns of the thoracic & cervical spine degenerate in vitamin B12 deficiency

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fasciculus cuneatus fasciculus gracilis

References

  1. Clinical Anatomy Made Ridiculously Simple. Stephen Goldberg, MedMaster Inc, Miami, 1995
  2. Principles of Neural Science, 3rd ed., Kandel, Schwartz & Jessell (eds), Elsevier, NY, 1991, pg 284, 356

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