spinal cord and spinal nerves Flashcards
the osinal cords extends from the
formaen magnum till l2
how amny spinal nerves do we have
31
the spinal nerves are motor or snesory
mixed
the two enlargements of teh psinal cord
cervical adn lumbar enlargement
the divisons of teh spinal nerve s
8 cervicak
12 thoracic
5 lumbar and scarel
1 coccyheal
the spinal cord terminates as
conus medullaris
nerves taht extend inferiorly from the conus medullaris are called
cauda equina
the meninges of teh spinal cord
dura pia and arachmnoid
the dura matetr of te spinal cord extends from the
level of the foramen magnum tikll S2
epidural space location
between the dura matter and the wall of teh vertebral canal ( fat fill)
epidural purposes
aenesthetics injecton
epidural is given at teh
l3 l4 verebtebra
the subdural spce contains
serous fluid
subarachnoid space is between the
pia and arachnoid matter
the subarachnoid space s filled wity
csf
the lumbar puncture is given
above the spinous process of l4
the gray matter is divded ibnto three horns
anterior lateral posterior
the lateral grey horn is only seen from
T1 -L2
whote matter is divided into three columns
abnterior posterior lateral
contains sensory and motor tracts
the central canal extends through
the entire spinal cord
what fluid is present n the central canal
csf
the central canal is continuos with the
fourth ventricle
the descending tracts carry info
from the brain to the periphery
the descending tracts are divided into
direct (pyramidal) indirect ( extrapyrimadal)
direct descednig tract has to dow with the
responsible of voluntary movement
indirect descending tract has t o do with
involuntary control and autonomic control ( balance , posture , muscle tone ) body movement coordination
the ascending sensory tract relays info from to
froom teh periphery to the brain
the ascendong tract is divded into
exteroceptive and propioceptive
exteroceptive has to do with
sensation outside the body
temp , touch, pain
propioceptive has t o dow with
inside the bofy , muscles, joint , organs
each sinal nerve is formed from
2 roots
the two roots of each spinal nerve
dorsal and ventral
dorsal root is
sensory root and ganglia
ventral root is
motor root
each root is formed from a set of
rootlets atatched to teh spinal cord
dermatomes
an area of the skin that provides teh cns with sensory info via one pair of spinal nerves
overlap