Comparison of structural details of different regions of the spinal cord Index Central canal Superiorly (Open) : Opens i...
Comparison of structural details of different regions of the spinal cord
Index
Central canal
- Superiorly (Open) : Opens into the cavity of the 4th ventricle
- Inferiorly (Closed) : In the conus medullaris, it expands to form the terminal ventricle & terminates below within the root of filum terminale
- It’s filled with CSF
- It’s lined by ciliated columnar epithelium (Ependyma)
Blood supply of the spinal cord
Arterial supply : Supplied by 3 small arteries + feeder arteries
Segmental spinal arteries
- ASA & PSA arteries are reinforced by segmental arteries, which enter the vertebral canal through the inter vertebral foramina
- These arteries are branches of arteries outside the vertebral column (Deep cervical, Intercostal & Lumbar arteries)
- Segmental arteries give rise to anterior & posterior radicular arteries
Feeder arteries
- Enter the vertebral arteries & anastomose with the ASA & PSA
- The most important feeder artery is the Great anterior medullar artery of Adamkiewicz
- It arises from the aorta at lower thoracic or upper lumbar vertebral levels
- Unilateral
- In the left side of most people
- Major source of blood to the lower 2/3 of the spinal cord
Veins of the spinal cord
- Drains mainly into the veins of the brain & the venous sinuses via 6 tortuous longitudinal channels
- Finally drain into the internal vertebral venous plexus
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