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Dermatomes overlap

Dermatomes overlap. Skin. Peripheral nerve. Dorsal root. Ventral root. Dermatomes overlap. Skin. Peripheral nerve. Dorsal root. Ventral root. Dorsal column. Spinal cords. Dorsal root ganglion. Lateral column. “Anterolateral” column. Ventral column. Dorsal root. Spinal nerve.

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Dermatomes overlap

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  1. Dermatomesoverlap Skin Peripheral nerve Dorsal root Ventral root

  2. Dermatomesoverlap Skin Peripheral nerve Dorsal root Ventral root

  3. Dorsalcolumn Spinal cords Dorsal rootganglion Lateral column “Anterolateral” column Ventral column Dorsal root Spinalnerve Dorsal horn Intermediate zone Ventral horn Ventral root

  4. Anterolateral system Dorsal column-medial lemniscal system Bare nerve ending Merkel’s receptor Meissner’s corpuscle Pacinian corpuscle Receptor projections to systems

  5. LgTermPatterns Reminder: Rexed’s laminae

  6. Demyelination Somatotopic organization of the dorsal columns DC lesion Rostral Caudal

  7. Lg&SmTermPatterns Lamina 5

  8. Lg&SmTermPatterns Lamina 5

  9. Anterolateral system X

  10. Spinal Hemisection Ipsilateral loss of touch… Contralateral loss of pain… (2-3 segments caudal to injury) Mechanoreceptor Nociceptor

  11. Syringomyelia Site of lesion • Bilateral loss of pain & thermal senses • Preservation of mechanosensations

  12. Somatotopy of spinal paths

  13. Postcentralgyrus / Insular/Cingulatecortex Postcentralgyrus / 1° SScx Dorsalcolumnnuclei Internalarcuatefibers Pain,thermal,itch Mechano… Dorsalhorn Spinalcommissure Dorsal column-medial lemniscalsystem Anterolateralsystem Also: •Reticular formation •Superior colliculus (mesencephalon)

  14. Medial dorsal Ventral posterior medial-VPM (trigem) Ventral posterior lateral-VPL (spinal) Touch Pain Ventral posterior (VMpo) Somatic Sensory Thalamus

  15. Leg area Arm area Face area Internal capsule Ventral posterior nucleus

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