Spinal Meninges and Spinal Cord Flashcards
What is the outermost layer of the spinal meninges
Dura mater. TOUGH MOTHA!!!
What does the dura mater fuse with laterally along spinal nn
the neural sheath distal to the DRG and with the margins of the intervertebral foramina
What spinal ligament does the dura mater attach to
the posterior longitudinal ligament
what terminal structure does the dura mater surround
filum terminale to form coccygeal ligament
What is located in the epidural space
fat and blood vessels
location of internal vertebral venous plexuses
What type of space is the subdural space and what is in it
potential space. filled with fluid and moistens apposed surfaces of dura and arachnoid mater
Where is the terminal limit of both dura and arachnoid mater
SV2
Where does the arachnoid mater join to become conitnuous with neural sheath at spinal n
DIRECTLY to dorsal and ventral roots
What type of space is the subarachnoid space and what is in it
real space filled with cerebrospinal fluid continuous with cranial subarachnoid space
What layer is the pia in regards to the spinal cord
closest
What are the structures to attach pia mater to the dura between nerve roots
denticulate ligaments
What acts as shock absorber in spinal cord and what anchors the cord
CSF-shock absorber in subarachnoid space. The pia anchor cord alterally via denticulate ligaments and then the pia mater sheathed by dura forming filium terminale anchor cord inferiorly
How long is the spinal cord approximately
45 cm
Why do our vertebral segments not align with nerves
because there is differential growth of the vertebral column after birth while the spinal cord is fully grown
What do dorsal and ventral roots arise from
rootlets of a single spinal cord segment
What is found in the DRG
primary cell bodies of sensory neurons
How many spinal nerves form and what fuses to make them
31 pairs of spinal nerves
fusion of dorsal and ventral roots
Divisions of spinal nerve pairs
8 cervical, 12 thoracic, 5 lumbar, 5 sacral and 1 coccygeal
What forms the cauda equina
the lower lumbar and sacral rootlets leaving spinal cord(at conus medullaris)
why are the cervical and lumbar regions of the spinal cord generally larger
increased number of nerve nuclei in the anterior horm
The anterior horn of spinal cord is motor or sensory?
motor
How many spinal a are on the anterior side and what does/do it/they arise from
1 anterior spinal a. arises from both vertebral aa and run along ventral median fissure
What is the name of the a that assists in the continuity of the anterior spinal a
segmental medullary aa
How many spinal aa are on the posterior side of the cord. origination?
2 posterior spinal aa arising of PICA posterior inferior cerebellar a.
what do the radicular aa turn into when they reach the spinal cord
segmental medullary aa
What segments of the cord are most vulnerable to ischemia and why
T1-T4 and L1 becuase these areas usually do not have radicular aa that reach all the way to the anterior and posterior aa
