unit 5: spinal nerves, intro

Question 1

pairs of spinal nerves, which attach to the spinal cord

Answer 1

31

Question 2

__ cervical nerve pairs, __ thoracic, ___ lumbar, ___sacral, __ coccygeal nerve pair

Answer 2

8
12
5
5
1

Question 3

the spinal nerves split into a strictly MOTOR ____ root and a SENSORY only ____ root

Answer 3

anterior

posterior

Question 4

a ramus differs from a root/rootlet because a ramus carries _____ info

Answer 4

mixed

Question 5

ANTerior spinal roots carry EFFERENT axons from CB in the ___ or ____ horns, and are attached to the SC by a series of rootlets

Answer 5

anterior

lateral

Question 6

POSTerior spinal roots carry axons from CB in the ____ ____ ____ ganglion

Answer 6

dorsal (posterior) root spinal ganglion

Question 7

the posterior root separates into a number of rootlets that attach to the cord at the ___ ___

Answer 7

posterolateral sulcus

Question 8

spinal ganglia are usually found inside or just MEDIAL to the ____, beyond the dura mater

Answer 8

IVF

Question 9

three exceptions of spinal ganglion locations are:

• C1/C2 ganglia are on their respective ___ ____
• sacral ganglia are WITHIN the ___ ____
• coccygeal ganglia is located INSIDE ___ ___

Answer 9

vertebral arches
vertebral canal
dura mater

Question 10

after combining into a mixed spinal nerve, a _____ branch is given off, which is present at all spinal levels

Answer 10

meningeal

Question 11

the meningeal branch reenters the vert canal thru the IVF & divides into ___, ___, & ____ branches

Answer 11

ascending
descending
transverse

Question 12

the meningeal branch provides SOMATOSENSORY & postganglionic SYMPATHETIC supply to the ____ (5 things) in the anterior & lateral parts of the canal

Answer 12

dura
BV
periosteum
ligaments
IVD

Question 13

the mixed spinal nerve divides into two (primary) rami: ___ & ____

Answer 13

posterior

anterior

Question 14

the _____ ramus splits into lateral & medial branches (except C1)

Answer 14

posterior

Question 15

the posterior ramus is smaller than the anterior ramus except at:

Answer 15

C1
S4
S5

Question 16

the POSTERIOR ramus lends ___ innervation to the deep back muscles and ____ to the skin on either side of the spine

Answer 16

motor

sensory

Question 17

the ANTERIOR ramus lends motor innervation to the ___ & ___ ___ muscles as well as the skeletal muscles of the ___

Answer 17

anterior & lateral trunk

extremities

Question 18

____ rami contribute to the great plexuses

Answer 18

anterior

Question 19

anterior ramus lends sensory innervation to the skin of the ____ as well as the ___ & ___ ___

Answer 19

extremities

anterior & lateral trunk

Question 20

these are located either at or just medial to the bifurcation of the mixed spinal nerve

Answer 20

sympathetic chain communicans

Question 21

__ __ ___ carries MYELINATED axons from CB in the LATERAL horn cells at T1-L2

Answer 21

white ramus communicans

Question 22

in the white ramus communicans, ___ ___ fibers enter the sympathetic chain and:

• synapse at that level or ____/____
• pass through to the ____

Answer 22

preganglionic sympathetic
ascend/descend
splanchnic

Question 23

WHITE rami communicans are associated only with nerves __-__

Answer 23

T1-L2

Question 24

__ __ ___ carries UNMYELINATED POSTganglionic sympathetic axons from CB in the sympathetic chain TO the spinal nerve

Answer 24

gray ramus communicans

Question 25

GRAY rami communicans are associated with these spinal nerves:

Answer 25

all spinal nerves