spinal cord and meninges Flashcards
where does the spinal cord begin
at the medulla oblongata and extends up the L1/L2 level
when is spinal cord and vertebral canal length (almost) equal
in fetus (12weeks)
what is the conus medullarise
conical inferior end of the spinal cord
what is the cauda equina
bundle of spinal nerve roots resembles horse tail
what is the filum terminale
continuation of pia mater
what is the dural cistern
dilated dural sac, ends at S2 vertebral level
spinal nerves exit….
the vertebral canal through intervertebral foramen
ventral rami of the spinal nerves form
nerve plexuses that supply the limbs
brachial plexus
supplies upper limb
lumbosacral plecus
supplies lower limg
dorsal root
sensory
ventral root
motor
outer most layer of meninges
dura mater
middle layer of meninges
arachnoid mater
inner most layer of meninges
pia mater
what is found between the arachnoid and pia mater
cerebrospinal fluid
dural sac
terminates at S2 vertebral level and is attached to the tip of the coccyx by filum terminale externum
what type of outflow is the sympathetic nervous system
thoracolumbar T1-L2
what type of outflow is parasympathetic outflow
craniosacral outflow (cranial outflow from brain and sacral outflow from pelvic splanchinc nerve)
deficiency of blood supply to spinal cord causes what
ischemia, muscle weakness and paralysis
describe what may cause cord compression
disc prolapse or bone metastasis
