spinal cord

Question 1

in adult, spinal cord occupies

Answer 1

upper 2/3 of vertebral column, from medulla oblongata of the brain stem to about the L1-2 interertebral disc level.

Question 2

in six month fetus, spinal cord occupies

Answer 2

from medulla oblongata to S1 vertebral level. point is, takes less space after birth and development because it doesnt grow after birth

Question 3

conus medullaris

Answer 3

a cone shaped structure where the spinal cord ends

Question 4

cauda equina

Answer 4

a collection of dorsal and ventral roots under the conus medullaris

Question 5

where does the dural sac that covers the spinal cord and cauda equina end?

Answer 5

at the S2 level of the vertebral column

Question 6

what is the meninges? what are its three layers?

Answer 6

covering of the spinal cord

layers: dura mater, arachnoid mater, pia mater

Question 7

dura mater

Answer 7

outermost, leathery-like layer of connective tissue that covers the spinal cord (and brain), the dorsal and ventral roots as they enter the intervertebral foramen, and the spinal ganglia.

Question 8

arachnoid mater

Answer 8

intermediate layer of meninges. has 3d appearance in the living wisps of arachnoid trabeculae span the space between the outer surface of the arachnoid mater and the deeper lying pia mater.

Question 9

what is the subarachnoid space filled with?

Answer 9

CSF

Question 10

pia mater

Answer 10

very thin and intimately invests blood vessels, dorsal and ventral roots and the entire surface of spinal cord and brain.