lecture 2: intro to neuro 2 Flashcards
how many segments of the spinal corn
31 segments
true or false: spinal nerve level does not correspond with vertebral level
true
are spinal nerves mixed?
yes
how many cervical nevres
8 pairs (c1-c8)
how many thoracic nevres
12 pairs (t1-t12)
how many lumbar nerves
5 pairs (l1-l5)
how many sacral nerves
5 pairs (s1-s5)
how many coccygeal nerves
1 pair (co)
each spinal segment is associated with what 2 things
myotome
dermatome
where does the spinal cord terminate
conus meddularis
what level does the spinal cord terminate at
L1/L2
is the cauda equina PNS or CNS
PNS
where do the spinal nerves form the cauda equina
lumbar cistern (space adter cord)
where do spinak nerves exit
intervertebral foramen
how are c1-c7 named
after the inferior vertbra
where does c5 exit
above the c5 vertebra
true or false: c1-c7 are named after the superior vert
false, the inferior
where does c8 n ecxit
between c7 and t1 vert
how are thoracic, sacral, lumbar and coccygeal nerves names
after superior vert.
true or false: the t8 nerve exits above the t8 vert.
false, below the t8 vert
true or false: up to 3 months of fetal age the spinal cord occupies the full length of the spinal canal
true
why does the spinal cord end at l1/l2
there is a relative ascent of spinal cord until early infance (vertebral/spinal col grows faster than the spinal cord)
=anchored by filum terminale (extension of pia matter) to sacrum
how is the spinal cord anchored
anchored by filum terminale (extension of pia matter) to the sacrum