spinal nerves

Question 0

which root carries efferent axons cell bodies located in the anterior or lateral horn

Answer 0

anterior (ventral or motor) root

Question 1

how many pairs of spinal nerves are there

Answer 1

31 pairs, 8 cervical, 12 thoracic, 5 lumbar, and 5 sacral and 1 coccygeal

Question 2

which root attaches to the spinal cord as a series of rootlets

Answer 2

anterior root

Question 3

which root carries axons from cell bodies located in the dorsal root (spinal ganglion)

Answer 3

posterior (dorsal or sensory) root

Question 4

how does the posterior root attach to the cord

Answer 4

as a number of rootlets that attach to the posterolateral sulcus

Question 5

where are the spinal ganglion located

Answer 5

inside or just medial to the intervertebral foramen, beyond the dura mater

Question 6

where are C1 and C2 ganglia located

Answer 6

on their respective vertebral arches

Question 7

where is the sacral ganglia located

Answer 7

within the vertebral canal

Question 8

where is the coccygeal ganglia located

Answer 8

inside the dura mater

Question 9

after the anterior and posterior roots combine what is the first branch to come off

Answer 9

the meningeal (recurrent meningeal, sinuvertebral) branch

Question 10

where can the meningeal branch be found

Answer 10

all spinal levels

Question 11

what is the path of the meningeal branch

Answer 11

it re-enters the vertebral canal trough the IVF and divides into ascending and descending and transverse brnaches

Question 12

what type of information is provided by the meningeal branch

Answer 12

somatosensory and sympathetic supply to the dura, blood vessels, periosteum, ligaments, IVD in the anterior and lateral portion of the canal

Question 13

what does the mixed spinal root break into

Answer 13

Posterior (dorsal) and anterior (ventral) ramus

Question 14

the posterior ramus splits into lateral and medial branches at all spinal levels except

Answer 14

C1

Question 15

the posterior ramus is smaller than the anterior ramus at all spinal levels except what level

Answer 15

C1, S4, and S5

Question 16

what is the motor innervation of the posterior ramus

Answer 16

motor innervation to the deep back muscles

Question 17

what is the sensory innervation of the posterior ramus

Answer 17

the skin on either side of the spine

Question 18

what is the motor innervation of the anterior ramus

Answer 18

the anterior and lateral trunk muscles, and to skeletal muscles in the extermities

Question 19

the anterior ramus contributes to what plexuses

Answer 19

the great plexuses

Question 20

where is the sympathetic chain located?

Answer 20

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

Question 21

Where can myelinated axons of the white ramus be found?

Answer 21

in the lateral horn cells at cord level T1-L2

Question 22

Preganglionic sympathetic fibers enter the sympathetic chain and go where?

Answer 22

1- synapse

2- pass through splachnic nerve

Question 23

what carries unmyelinated postganglionic sympathetic axons from cell bodies in the sympathetic chain to the spinal nerves?

Answer 23

gray ramus communicans

Question 24

what suboccipital muscles are the motor supply from C1?

Answer 24

• rectus capitis posterior major and minor
• obliquus capitis superior and inferior
• semispinalis capitis

Question 25

what are the two branches of C2?

Answer 25

medial (greater occipital nerve) and lateral branch

Question 26

the greater occipital nerve innervates what?

Answer 26

sensory innervation to the posterior neck and scalp

Question 27

what is innervated by the lateral branch of the C2?

Answer 27

motor supply to semispinalis capitis, longissimus capitis, spenius capitis muscles

Question 28

What are the two branches of C3?

Answer 28

the medial (least occipital nerve) and lateral

Question 29

what is innervated by least occipital nerve

Answer 29

sensory supply from skin of posterior neck

Question 30

what is supplied the lateral branch of C3?

Answer 30

motor supply to semispinalis capitis, longissimus capitis, splenius capitis

Question 31

what is innervated by the medial branch of C4-C8?

Answer 31

sensory supply from the skin of the posterior neck

Question 32

what is supplied by the lateral branch of C4-C8?

Answer 32

motor supply to iliocostalis cervcis, longissimus cervicis and capitis