contents of vertebral canal Flashcards
How many pairs of spinal nerves are there?
31- 8 Cervical 12 Thoracic 5 Lumbar 5 Sacral 1 coccygeal
Where does the spinal cord end in newborns?
L2/3
Where does the spinal cord end in adults
L1/2 at the conus medullaris
Name the two enlargements of the spinal cord
Cervical- C4-T1
lumbar- L1-S3
what is cordus equinas?
bundle of spinal nerves (L2 onwards) in lumbar cistern
What are denticulate ligaments?
extensions of pia mater to stabilise spinal cord.
The three layer of meninges surrounding the spinal cord continue to surround the spinal nerves as the what?
epineurum
What is located in the subarachnoid space?
CSF
radicular/ segmental medullary/ spinal arteries and veins
What is located in the epidural space?
Loose CT semi-liquid fat internal venous plexus lymphatics spinal nerve roots
describe the posterior spinal arteries
arise from posterior inferior cerebellar/ vertebral arteries, supply ipsilateral grey and white posterior columns of spinal cord
Describe the anterior spinal artery
arises from vertebral artery and supplies grey and white matter of anterior spinal cord
where do segmental spinal arteries arise?
depending on vertebral level- vertebral arteries, posterior intercostal arteries, lumbar arteries, lateral sacral arteries
what comes off segmental spinal arteries?
radicular arteries- supply spinal nerves
segmental medullary arteries- assist the spinal arteries mainly in areas of enlargements
how many ant/post spinal veins are there
3 of each
where do spinal/ segmental medullary/ radicular veins drain?
internal venous plexus
