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Flashcards in Spinal Nerves Part 1 Deck (32)
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1

How many spinal nerves are in a typical person?

62 spinal nerves (31 pairs)

2

How many coccygeal nerve pairs are there typically?

1 pair

3

How many sacral nerve pairs are there typically?

5 pairs

4

What kind of axons are carried by the anterior roots of the spinal cord?

efferent axons

5

Which roots of the spinal cord are considered motor roots?

anterior (ventral) roots

6

Where are the cell bodies located of the axons carried by the anterior roots?

in the anterior (ventral) or lateral horns (if present)

7

How are the anterior roots of the spinal nerves attached to the spinal cord?

by a series of rootlets

8

Where are the cell bodies of the axons carried by posterior roots of the spinal nerves?

cell bodies are located in the dorsal root ganglion

9

What are the other acceptable names for the dorsal root ganglion?

posterior root ganglion or spinal ganglion

10

Where do the rootlets of the posterior root attach to the spinal cord?

posterolateral sulcus

11

Which roots of the spinal nerves can be considered sensory roots?

posterior (dorsal)

12

Where are spinal ganglia typically located?

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

13

Where are the C1 and C2 spinal ganglia located?

on their respective vertebral arches

14

Where are sacral spinal ganglia located?

within the vertebral canal

15

Where are the coccygeal spinal ganglia located?

inside dura mater

16

Shortly after combining into a mixed spinal nerve, what branch is given off?

meningeal (aka recurrent meningeal or sinuvertebral) branch

17

Where are the cell bodies of the meningeal branch located?

in sympathetic trunk (postganglionic sympathetics)

18

What does the sinuvertebral branch supply?

the disc

19

At what levels are sinuvertebral branches present?

all levels

20

Meningeal branches re-enter the vertebral canal through the IVF and divide into what?

ascending, descending and transverse branches

21

The meningeal/sinuvertebral branches supply what kind of info to the dura, and periosteum in the anterior/lateral portions of the canal?

somatosensory and sympathetic supply

22

What kind of info is supplied by the meningeal branches to the blood vessels, ligaments and intervertebral discs of the anterior/lateral portions of the canal?

somatosensory and sympathetic

23

What two primary rami does the mixed spinal nerve divide into?

anterior and posterior ramus

24

T/F: The posterior ramus of the mixed spinal nerve divides into lateral and medial branches at every level of the spinal cord.

False; no C1

25

Where are the only places that the anterior ramus is smaller than the posterior ramus?

C1, S4, and S5

26

Which ramus supplies motor innervation to the deep back muscles?

posterior (dorsal) ramus

27

Which ramus supplies sensory innervation to the skin on either side of the spine?

posterior (dorsal) ramus

28

T/F: both the anterior rami and the posterior rami are mixed nerves.

True

29

Which ramus supplies motor innervation to the anterior and lateral trunk muscles?

anterior (ventral) ramus

30

Which ramus supplies motor innervation to skeletal muscles in the extremities?

anterior (ventral) ramus