SPINAL CORD
Dr. Saeed Shafi
Objectives
Positional changes of spinal cord
• Uptil 3rd
month, the spinal cord extends the
whole length of vertebral canal
• At 6 mo...
5th
Month
At Birth
3rd
month
Parts of the spinal cord
• Conus medularis
• Cauda equina
• Filum terminale
• Lumbar subarachnoid cistern
• Formation of:-
– ventral medial fissure
– Dorsal median sulcus
– Sulcus limitans
Lumen of neural tube
• Cavity of neural tube develops into
ventricular system of CNS
– Two lateral ventricles in cerebral ...
Gray matter of spinal cord
• It is derived from differential growth of
mental zone of neural tube results in
formation of
...
White matter of spinal cord
• It is derived from growth of axons from
mental zone of spinal cord, brain and
neurons (of ne...
Spinal cord& brainstem
Spinal cord& brainstem
Spinal cord& brainstem
Spinal cord& brainstem
Spinal cord& brainstem
Spinal cord& brainstem
Spinal cord& brainstem
Spinal cord& brainstem
Spinal cord& brainstem
Spinal cord& brainstem
Spinal cord& brainstem
Spinal cord& brainstem
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Spinal cord& brainstem

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Spinal cord& brainstem

  1. 1. SPINAL CORD Dr. Saeed Shafi
  2. 2. Objectives
  3. 3. Positional changes of spinal cord • Uptil 3rd month, the spinal cord extends the whole length of vertebral canal • At 6 month it lies at level of S1 • At birth – at level L3 • In adult – at level L1 • The dura & arachnoid extends up to S2 in the adults. However, piamatter finishes at the apex of conus medularis and then continues as filum terminale
  4. 4. 5th Month
  5. 5. At Birth
  6. 6. 3rd month
  7. 7. Parts of the spinal cord • Conus medularis • Cauda equina • Filum terminale • Lumbar subarachnoid cistern
  8. 8. • Formation of:- – ventral medial fissure – Dorsal median sulcus – Sulcus limitans
  9. 9. Lumen of neural tube • Cavity of neural tube develops into ventricular system of CNS – Two lateral ventricles in cerebral hemispheres – 3rd ventricle in diencephalon – 4th ventricle behind brain stem – Central canal of spinal cord – Aquiduct of midbrain
  10. 10. Gray matter of spinal cord • It is derived from differential growth of mental zone of neural tube results in formation of – Alar plate (dorsal gray horn) – Basal plate (ventral and lateral gray horn) – Roof plate (posteriorly) – Floor plate (anteriorly) – Sulcus limitanse (separating alar and basal plates)
  11. 11. White matter of spinal cord • It is derived from growth of axons from mental zone of spinal cord, brain and neurons (of neural crest origin) in dorsal root ganglia. Later on these axons are myelinated resulting in formation of white matter of spinal cord (white matter)

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