Exam 2 Spinal Nerves/ Cervical Plexus Flashcards Preview

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Flashcards in Exam 2 Spinal Nerves/ Cervical Plexus Deck (79)
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1

What are the numbers for each spinal group that make up the spinal nerve pairs

- 8 cervical pairs
- 12 thoracic pairs
- 5 lumbar pairs
- 5 sacral nerve pairs
- 1 coccygeal nerve pair

2

What do the anterior (ventral or motor) roots carry

Efferent axons from cell bodies

3

Where are the cell bodies located from the efferent information carried by the anterior (ventral or motor) roots

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

4

How is the anterior roots of the spinal nerves connected to the spinal cord

By a series of rootlets

5

What do the posterior roots of spinal nerves cary

Axons from cell bodies in the dorsal root ganglion

6

What is another name for the dorsal (posterior) root ganglion

Just spinal ganglion

7

What is type of roots are carried in the posterior/dorsal roots of the spinal nerves

Sensory

8

Where do the posterior roots attach after being separated into a number of rootlets

Posterolateral sulcus

9

Where are spinal ganglia typically located

Either inside or just medial to the IVF beyond the dura mater innervated by the epineuranium

10

For the posterior roots of C1 and C2 where are their ganglia located

On their respective vertebral arches

11

Where are the sacral ganglia located for the posterior roots

Within the vertebral column outside the dura

12

Where are the coccygeal ganglia located for the posterior roots

Located inside the dura mater

13

After combining the spinal nerves become what type of spinal nerve

Mixed!

14

What branch is given off shortly after the spinal nerves combine to make it mixed

A meningeal branch is given off

15

What are two other names for the meningeal branch given off

-recurrent meningeal
- sinuvertebral

16

What is present at all spinal nerves

The meningeal branch

17

Where does the meningeal branch re-enter the vertebral canal and what happens to it

The IVF and divides into ascending, descending, and transverse branches

18

What does the meningeal branch do

Provides somatosensory and sympathetic supply to the dura, blood vessels, periosteum, ligaments, and IVD’s in the anterior and lateral portions of the canal

19

The mixed spinal nerve divides into two primary rami what are they

- posterior (dorsal) primary ramus
- anterior (ventral) primary ramus

20

The posterior (dorsal) primary ramus splits into what with what exception

Lateral and medial branches EXCEPT C1, so C2 and below

21

The posterior (dorsal) primary ramus is smaller or larger than the anterior ramus except where

Smaller EXCEPT C1, S4, and S5

22

The posterior (dorsal) primary ramus carries motor innervation to where

Deep back muscles

23

The posterior (dorsal) primary ramus carries sensory info from where

The skin paraspinally (either side of the spine)

24

Where does the anterior (ventral) primary ramus motor fibers innervate

Anterior and lateral trunk muscles as well as extremities

25

Where does the anterior (ventral) primary ramus carry sensory info to

Skin of extremities and anterior/lateral trunk

26

What does the anterior rami contribute to

The great plexuses

27

Where is the sympathetic chain communications located

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

28

What does the white ramus communicans carry

Myelinated axons from cell bodies located in lateral horn cells at cord levels T1 - L2

29

Where do preganglionic sympathetic fibers of the sympathetic chain enter

Via the white rami communicans

30

What do preganglionic sympathetic fibers entering the sympathetic chain do?

- synapse in a sympathetic chain ganglion
- pass through via splanchnic nerves