Spinal nerves

Question 1

how many pairs of spinal nerves?

Answer 1

31

Question 2

where are spinal ganglia/ posterior root ganglia usually located?

Answer 2

inside or just medial to the IVF beyond the dura

Question 3

where are sacral ganglia located?

Answer 3

within the vertebral canal- beyond dura

Question 4

what branch is given off a mixed spinal nerve?

Answer 4

meningeal/ recurrent meningeal nerve

Question 5

what nerve supplies somatosensory and sympathetic supply to the dura, blood vessels, periosteum, ligaments and IVD in the anterior and lateral portions of the canal?what are its 3 branches

Answer 5

recurrent meningeal- ascending, descending and transverse branches

Question 6

the mixed spinal nerve divides into what 2 rami?

Answer 6

dorsal and ventral primary rami

Question 7

what does the dorsal primary rami supply?

Answer 7

motor- deep back muscles

sensory- skin on either side of spine

Question 8

what does the ventral primary rami supply?

Answer 8

motor- skeletal muscles in extremities
sensory- skin of extremities and anterior and lateral trunk

also contributes to the great plexuses

Question 9

where is the sympathetic chain ganglia located?

Answer 9

at or just medial to the bifurcation of the mixed spinal nerve

Question 10

the white ramus communicans supplies what cord levels?

Answer 10

lateral horns of T1-L2

Question 11

what type of fibers are the white ramus communicans?

Answer 11

myelinated preganglionic sympathetic fibers

Question 12

what type of fibers are the gray ramus communicans?

Answer 12

unmyelinated postganglionic sympathetic TO the spina nerve

Question 13

what levels do the gray ramus communicans supply?

Answer 13

ALL levels

Question 14

what forms the cervical plexus?

Answer 14

anterior primary rami of the C1-C4 spinal nerves

Question 15

C1 fibers that stay with the hypoglossal nerve supply which muscles?

Answer 15

thyrohyoid and geniohyoid

Question 16

SCM receives proprioception fibers from?

Answer 16

C2,C3,C4

Question 17

levator scapula and middle scalene receive fibers from?

Answer 17

C3 and C4

Question 18

trapezius receives fibers from?

Answer 18

C2

Question 19

where does the phrenic nerve receive postganglionic sympathetic fibers from?

Answer 19

cervical ganglia

Question 20

what is the largest of the thoracic nerves?

Answer 20

T12- subcostal nerve

contributes to the lumbar plexus

Question 21

what muscles do the intercostal nerves supply at every level?

Answer 21

internal, external and innermost intercostal
serratus posterior
transversus thoracis

Question 22

what muscles do T7-11 intercostal nerves supply?

Answer 22

transverse abdominal
internal abdominal oblique
external abdominal oblique
rectus abdominus

Question 23

what are the 3 branches of the anterior division of the femoral nerve?

Answer 23

intermediate cutaneous nerve of the thigh
medial cutaneous nerve of the thigh
nerve to the sartorius

Question 24

what does the posterior division of the femoral nerve give rise to?

Answer 24

muscular branches- quadriceps
vascular branches- femoral artery
articular branches- knee joint into saphenous nerve