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Flashcards in spinal nerves Deck (33)
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0

how many pairs of spinal nerves are there

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

1

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

anterior (ventral or motor) root

2

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

anterior root

3

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

posterior (dorsal or sensory) root

4

how does the posterior root attach to the cord

as a number of rootlets that attach to the posterolateral sulcus

5

where are the spinal ganglion located

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

6

where are C1 and C2 ganglia located

on their respective vertebral arches

7

where is the sacral ganglia located

within the vertebral canal

8

where is the coccygeal ganglia located

inside the dura mater

9

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

the meningeal (recurrent meningeal, sinuvertebral) branch

10

where can the meningeal branch be found

all spinal levels

11

what is the path of the meningeal branch

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

12

what type of information is provided by the meningeal branch

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

13

what does the mixed spinal root break into

Posterior (dorsal) and anterior (ventral) ramus

14

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

C1

15

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

C1, S4, and S5

16

what is the motor innervation of the posterior ramus

motor innervation to the deep back muscles

17

what is the sensory innervation of the posterior ramus

the skin on either side of the spine

18

what is the motor innervation of the anterior ramus

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

19

the anterior ramus contributes to what plexuses

the great plexuses

20

where is the sympathetic chain located?

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

21

Where can myelinated axons of the white ramus be found?

in the lateral horn cells at cord level T1-L2

22

Preganglionic sympathetic fibers enter the sympathetic chain and go where?

1- synapse
2- pass through splachnic nerve

23

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

gray ramus communicans

24

what suboccipital muscles are the motor supply from C1?

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

25

what are the two branches of C2?

medial (greater occipital nerve) and lateral branch

26

the greater occipital nerve innervates what?

sensory innervation to the posterior neck and scalp

27

what is innervated by the lateral branch of the C2?

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

28

What are the two branches of C3?

the medial (least occipital nerve) and lateral

29

what is innervated by least occipital nerve

sensory supply from skin of posterior neck