spinal cord

Unit 4

SAME

sensory, afferent; motor, efferent

sensory input→ _____ → ____

PNS, CNS

___→___→ movement

CNS, PNS

the peripheral nervous system consists of ___ pairs of spinal nerves and ___ pairs of cranial nerves

31, 12

the central nervous system consists of the ___ and ___ ___

brain, spinal cord

serves as communication between the brain and PNS (also a reflex center)

spinal cord

the spinal cord extends from the foramen ___ to approx. the ___ or ___ vertebrae level

magnum, L1, L2

distal tapered end of spinal cord

conus medullaris

collection of spinal nerve roots extend inferior to spinal cord

cauda equina

extension of the pia mater from the conus medullaris anchoring to the posterior surface of coccyx

filum terminale

2 major enlargements of the spine include:

1. cervical enlargement

2. lumbosacral enlargement

the cervical enlargement is the ____ plexus and the lumbosacral enlargement is the ___ plexus

brachial, lumbosacral

the spinal cord is protected by which 3 things:

1. bones

2. meninges

3. CSF

triangular extensions of the pia mater that anchor the spinal cord to the dura mater

denticulate ligaments

the meningeal spaces of the spine are te same as the brain except for the ____ space

epidural

an epidural is given around

T10-L1

a spinal tap is given below ___ to avoid the ____ cord

L2, spinal

an epidural is given in the ___ layer before the dura mater

fat

a spinal tap goes into the ___ space

subarachnoid

dorsal

posterior

ventral

anterior

dorsal side is

sensory

ventral side is

motor

sensory neuron cell bodies

dorsal root ganglion

the v horn has

lower motor axons

the d horn has

sensory axons, interneurons

the v/d roots contain (of their type of nerve)

axons

the spinal nerve contains

mixed motor and sensory axons

the v rami contain

motor and sensory axons to muscles and skin of anterior trunk and limbs

the d rami contain

motor and sensory axons to muscles of the skin of the back

A

dorsal horn

B

dorsal root

C

spinal nerve

D

ventral root

E

ventral horn

F

white matter

G

ventral ramus

H

dorsal ramus

I

dorsal root ganglion

J

fat

K

dura mater

L

arachnoid mater

M

pia mater

A

cervical vertebrae

B

lumbosacral enlargement

C

conus medullaris

D

cauda equina

E

filum terminale

red

denticulate ligaments

green

dura mater

blue

arachnoid mater

pink

pia mater