Spinal cord and Meninges Flashcards
what is the spinal cord
part of CNS
major reflex center and conduction pathway between body and brain
where does the spinal cord begin and end
at medulla oblongata
end at L1/L2 vertebral level
how many pairs of spinal nerves exit the spinal cord
31
vertebral canal grows and spinal cord ends at L1-L2 level in adults
remaining spinal nerves form cauda equina
ggg
whats the conus medullarise
conical inferior end of spinal cord L1/2
whats the cauda equina
bundle of spinal nerve roots
resemble horse tail
whats the filum terminale
continuation of pia mater
whats the dural cistern
dilated dural sac
ends at S2 vertebral level
what is the grey matter
H shaped
cell bodies located here
what is the white matter
axons
what are nissl bodies
rough endoplasmic reticulum in cell bodies
where do spinal nerves exit from
the intervertebral foramen
what forms nerve plexus that supply the limbs
ventral rami
what nerve plexus supplies upper limb and lower
brachial plexus to upper
lumbosacral to lower
what are meninges
surround and support spinal cord
what are the layers of meninges
dura mater (outer)
arachnoid
pia mater
where is cerebrospinal fluid in the meninges
between arachnoid and pia mater
what is the dural sac
dura mater that terminates at S2
attached to tip of coccyx by filum terminale externum
how is the sac connected to the coccyx
by filum terminale externum
what part of the spinal cord has sympathetic outflow and where are the cell bodies located
T1-L2
cell bodies in lateral horn of grey matter
what part of the spinal cord has parasympathetic outflow
craniosacral
cranial from brain
pelciv splanchnic nerve S2-S4
what is the venous drainage of the spinal cord
internal vertebral venous plexus, drains to cerebral dural venous sinuses
cord compression from disc prolapse or bone metastasis from primary cancer/stenosis of vertebral canal = loss of motor function
ggg
where can lumbar puncture be done
L3-L4
L4-L5
subarachnoid space
collect CSF
where is epidural anaesthesia injected
epidural space
