Ascending And Descending Tracts Of Spinal Cord Ppt May 2026

  • Open floor for questions.
  • References: Snell's Clinical Neuroanatomy, Haines' Neuroanatomy Atlas, Nolte's Principles of Human Neuroanatomy.

    • | Tract | Modality | Decussation | Destination | |-------|----------|-------------|--------------| | DCML | Fine touch, vibration, proprioception | Medulla | Cortex | | Spinothalamic | Pain, temperature, crude touch | Spinal cord | Cortex | | Spinocerebellar (post) | Unconscious proprioception | None | Cerebellum | | Spinocerebellar (ant) | Unconscious proprioception | Twice | Cerebellum |

  • Visual Suggestion: Use a cross-section showing fibers crossing anterior to the central canal.
  • Clinical Pearl: A lateral cord hemisection (Brown-Séquard) causes contralateral loss of pain/temp below the lesion (because fibers have already crossed).
  • Contralateral findings (opposite side):
  • At level of lesion: Ipsilateral LMN signs & loss of all sensation.

    • Visual: Spinal cord cross-section with colors showing affected tracts. ascending and descending tracts of spinal cord ppt

    If you want, I can:

    Which would you like?

    | Tract | Modality | Decussation | |-------|----------|--------------| | Lateral Spinothalamic | Pain, temperature | Spinal cord | | Anterior Spinothalamic | Crude touch, pressure | Spinal cord | | Fasciculus Gracilis & Cuneatus | Fine touch, vibration, proprioception | Medulla | | Posterior Spinocerebellar | Unconscious proprioception | None (ipsilateral) | | Anterior Spinocerebellar | Unconscious proprioception | Spinal cord (double crossing) | Open floor for questions

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