Spinal Nerves Part 2

Question 1

Where are sympathetic chain communications located?

Answer 1

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

Question 2

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

Answer 2

False; these are myelinated

Question 3

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

Answer 3

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

Question 4

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

Answer 4

True

Question 5

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

Answer 5

False; these can ascend/descend BEFORE synapsing

Question 6

What spinal nerves are white rami communicans associated with?

Answer 6

T1-L2 only

Question 7

What kind of fibers are associated with white rami communicans?

Answer 7

preganglionic sympathetics

Question 8

What kind of fibers are associated with gray ramus communicans?

Answer 8

postganglionic sympathetics

Question 9

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

Answer 9

True

Question 10

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

Answer 10

sympathetic chain

Question 11

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

Answer 11

False; gray rami communicans are associated with each spinal nerve

Question 12

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

Answer 12

True

Question 13

What is supplied by the posterior rami of C1?

Answer 13

motor supply to suboccipital muscles

Question 14

What are the suboccipital muscles? (5)

Answer 14

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

Question 15

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

Answer 15

greater occipital nerve

Question 16

What does the medial branch of C2 supply?

Answer 16

sensory to the posterior neck and scalp

Question 17

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

Answer 17

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

Question 18

What is the name for C3 medial branch?

Answer 18

third (least) occipital nerve

Question 19

What does C3 supply sensory info to?

Answer 19

skin of posterior neck

Question 20

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

Answer 20

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

Question 21

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

Answer 21

skin of posterior neck

Question 22

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

Answer 22

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

Question 23

What anterior (primary) rami form the cervical plexus?

Answer 23

anterior rami of C1-C4 spinal nerves

Question 24

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

Answer 24

inferior vagal ganglion

Question 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.

Answer 25

True

Question 26

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

Answer 26

the superior root of ansa cervicalis

Question 27

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

Answer 27

thyrohyoid and geniohyoid

Question 28

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

Answer 28

vasomotor, sudomotor, and pilomotor

Question 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?

Answer 29

usually 3

Question 30

Where does the lesser occipital nerve carry fibers from?

Answer 30

C2 and occasionally C3

Question 31

What supplies the skin of the superior 1/3 of the auricle and the skin behind thee ear?

Answer 31

lesser occipital nerve

Question 32

What are the 7 superificial branches of the cervical plexus?

Answer 32

lesser occipital nerve, great auricular nerve, transverse cutaneous nerve, trunks of C3/C4, medial supraclavicular nerve, intermediate supraclavicular nerve, and Lateral supraclavicular nerve (LOG AT CT MIL)

Question 33

What nerves does the lesser occipital nerve communicate with?

Answer 33

the greater occipital nerve and the great auricular nerve

Question 34

What nerve may be implicated in cerivocgenic headaches?

Answer 34

lesser occipital nerve