1
Is the spinal cord a part of the CNS or PNS?
CNS
3 protections of the spinal chord
bone, meninges, CSF
Are the spinal nerves a part of the CNS or PNS
PNS
what is the function of the Pia mater?
anchors blood vessels to cord
what are the 4 subdivisions of the spinal cord from superior to inferior?
cervical, thoracic, lumbar, sacral
the dura mater does NOT ________________ or ______________
1. consist of 2 layers
2. form a septa
How many pairs of spinal nerves are there?
31
what is gray commissure?
connects L & R masses of grey matter, allows both sides to communicate, ENCLOSES CENTRAL CANAL
what is the arachnoid mater made of?
is it vascular or avascular?
1. collagen/elastic fibers
2. septa
What is the specific location of the spinal cord?
- begins at foramen magnum
- ends at conus medullaris (@ L1 vertebra)
what is the Pia mater made of?
What are the 2 important functions of the spinal cord & nerves?
1. link between the body and brain (sensory input/ motor output)
2. Spinal reflexes (explain)
- cervical enlargement
- lumbar enlargement
extensions of the Pia mater form ______________
*Bonus for 100*
where is the only place that lateral horns are located?
denticulate ligaments ( anchor dura mater, suspend cord within CSF of subarachnoid space)
Bonus answer: thoracic and lumbar regions of the spinal cord
where is the epidural space located?
*Bonus for 100*
Are spinal cords sensory, motor, or both?
between bone of vertebral canal and outer surface of dura mater; contains fat & blood vessels
Bonus: Both!! dorsal and ventral roots fuse, so all spinal cords are mixed
what is the conus medullaris? and where is it?
- terminal portion (no longer inclosed)
- between T12 and L1
what is the Cauda equina?
collection of nerves at inferior end of vertebral canal; arise from the spinal cord but must travel further to teach appropriate intervertebral forming to exit
dorsal, ventral, & lateral horns
what is the dura mater
dense CT forming tube enclosing spinal chord
What are the motor function of the 3 parts of the gray matter
Dorsal: somatic AND viceral sensory input
Ventral: somatic motor ONLY
Lateral: visceral (autonomic) motor ONLY
*for 600*
1. dorsal nerves _________ ____________ ____________ from dorsal root of spinal nerves
2. Ventral horns are ______________ __________ whose axons leave cord in ventral root of spinal cord
3. Lateral horns are _____________ ____________ whose axons leave cord in ventral root
1. receive sensory information
2. motor neurons
3. motor neurons
dura mater extends to ______________ where it closes
level of S2 vertebra
what is the Pia mater called when it extends past the conus medullaris?
and what is the function of this?
- filum terminale
- attaches to the coccyx anchoring spinal cord in vertebral canal
for *600*
1. What are the 4 zones of grey matter
2. Is the dorsal pathway sensory or motor?
3. Is the ventral pathway sensory or motor?
1. Somatic sensory, Visceral sensory, Visceral motor, and somatic motor
2. sensory
3. motor
Between what vertebra is the epidural given and why?
- between L4 and L5
- make sure the needle doesn't pierce the spinal cord