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Flashcards in Spinal Nerves Part 2 Deck (34)
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1

Where are sympathetic chain communications located?

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

2

T/F: axons carried in the white ramus communicans are unmyelinated.

False; these are myelinated

3

Where are the cell bodies of axons carried by white ramus communicans?

cell bodies of these axons can be found in the lateral horn cells at cord levels T1-L2

4

T/F: Preganglionic splanchnic sympathetic fibers enter the sympathetic chain and go through the trunk.

True

5

T/F: some preganglionic sympathetic fibers enter the sympathetic chain and ascend/descend after synapsing.

False; these can ascend/descend BEFORE synapsing

6

What spinal nerves are white rami communicans associated with?

T1-L2 only

7

What kind of fibers are associated with white rami communicans?

preganglionic sympathetics

8

What kind of fibers are associated with gray ramus communicans?

postganglionic sympathetics

9

T/F: the gray rami communicans carry unmyelinated postganglionic sympathetic axons from cell bodies to the spinal nerve.

True

10

Where are the cell bodies of the axons carried by the gray ramus communicans?

sympathetic chain

11

T/F: Gray rami communicans are associated with T1-L2 only.

False; gray rami communicans are associated with each spinal nerve

12

T/F: the suboccipital nerve (C1) does not split.

True

13

What is supplied by the posterior rami of C1?

motor supply to suboccipital muscles

14

What are the suboccipital muscles? (5)

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

15

What is the name of the medial branch of C2 posterior rami?

greater occipital nerve

16

What does the medial branch of C2 supply?

sensory to the posterior neck and scalp

17

What is the motor supply to semispinalis capitis, longissimus capitis, and splenius capitis?

C2 lateral branch (C1 also supplies motor to semispinalis capitis)

18

What is the name for C3 medial branch?

third (least) occipital nerve

19

What does C3 supply sensory info to?

skin of posterior neck

20

What does the lateral branch of C3 supply motor info to?

same muscles as C2 (semi cap, long cap, and splenius cap)

21

What do the medial branches of C4-C8 carry sensory info from?

skin of posterior neck

22

What do the lateral branches of C4-C8 supply motor info to?

iliocostalis cervicis, longissimus cervicis, and capitis (I Love Lucy)

23

What anterior (primary) rami form the cervical plexus?

anterior rami of C1-C4 spinal nerves

24

Fibers from what ganglion communicate with the loop formed by C1 and C2?

inferior vagal ganglion

25

T/F: Fibers from the spinal accessory nerve carry proprioceptive info and communicate with the loop formed by C2 and C3 and with C3 and C4.

True

26

The hypoglossal nerve communciated with C1 fibers that will later separate to become what structure?

the superior root of ansa cervicalis

27

C1 fibers that remain with the hypoglossal nerve supply what 2 muscles?

thyrohyoid and geniohyoid

28

What kind of postganglionic sympathetic fibers are carried by the gray rami communicans associated with communications with the superior cervical ganglion?

vasomotor, sudomotor, and pilomotor

29

How many gray rami communicans are associated with the communications with superior cervical ganglion and the loop between C1 and C2 and the roots of C3 and C4?

usually 3

30

Where does the lesser occipital nerve carry fibers from?

C2 and occasionally C3