Quiz 4: Cervical Plexus

Question 1

The cervical plexus is formed by the anterior primary rami of ____ through ____ spinal nerves.

Answer 1

C1, C4

Question 2

T/F: The nerve roots of the cervical plexus form a series of communicating loops.

Answer 2

True

Question 3

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

Answer 3

Inferior Vagal Ganglion

Question 4

Fibers from the spinal accessory nerve carry ____________ information.

Answer 4

Proprioceptive

Question 5

Fibers from the spinal accessory nerve communicate with the loop formed by what?

Answer 5

C2 & C3 with C3 & C4

Question 6

Fibers from sternocleidomastoid travel to _____.

Answer 6

C2

Question 7

Fibers from Trapezius travel to ______.

Answer 7

C3 & C4.

Question 8

The hypoglossal nerve communicates with C1 fibers that will later separate from the hypoglossal nerve to become what?

Answer 8

Superior root of the ansa cervicalis

Question 9

C1 fibers from the hypoglossal nerve supply what muscles?

Answer 9

Thyrohyoid & Geniohyoid

Question 10

Usually three gray rami communicans carry ___________ __________ fibers to the loop between C1 & C2 and roots of C3 & C4.

Answer 10

Postganglionic sympathetic

Question 11

What type of postganglionic sympathetic fibers, specifically, are carried in the gray rami communicans?

Answer 11

Vasomotor, Sudomotor and Pilomotor

Question 12

What does vasomotor supply?

Answer 12

Muscular lining in blood vessels

Question 13

What does sudomotor supply?

Answer 13

Sweat glands

Question 14

What does pilomotor supply?

Answer 14

Hair follicles

Question 15

What does the lesser occipital nerve supply?

Answer 15

• Skin on superior 1/3 of auricle

- Skin behind the ear

Question 16

The Lesser Occipital Nerve carries fibers from what level(s)?

Answer 16

C2 (and occasionally C3)

Question 17

Why is the lesser occipital nerve clinically significant?

Answer 17

May be implicated in cases of cervicogenic headache. Adjusting C1/C2 and occiput can help.

Question 18

The Great Auricular Nerve carries fibers from what level?

Answer 18

C2 & C3

Question 19

Where does the Great Auricular Nerve enter?

Answer 19

The parotid gland

Question 20

What does the Great Auricular Nerve divide into?

Answer 20

Anterior and Posterior Branches

Question 21

The anterior branch of the Great Auricular Nerve combines with what nerve?

Answer 21

Facial Nerve VII

Question 22

What does the anterior branch of the Great Auricular Nerve (& CN VII) supply?

Answer 22

The skin over the parotid gland

Question 23

What does the posterior branch of the Great Auricular Nerve supply?

Answer 23

Skin over the mastoid process.

Question 24

Where does the Transverse Cutaneous Nerve of the neck carry fibers from?

Answer 24

C2 & C3

Question 25

What two branches does the Transverse Cutaneous Nerve of the neck divide into?

Answer 25

- Ascending branch | - Descending branch

Question 26

What do the ascending and descending branches of the Transverse Cutaneous Nerve of the neck supply?

Answer 26

Skin over the platysma muscle

Question 27

The trunks from C3 & C4 combine to form a trunk that gives rise to what?

Answer 27

Medial, Intermediate and Lateral Supraclavicular Nerves

Question 28

What does the Medial Supraclavicular Nerve supply?

Answer 28

Skin inferior to the sternal end of the clavicle, as far inferior as the second rib.

Question 29

What does the Intermediate Supraclavicular Nerve supply?

Answer 29

Skin over the deltoid and pectoralis major, as far inferior as the second rib.

Question 30

What does the Lateral Supraclavicular Nerve supply?

Answer 30

Skin over the superior and lateral aspects of the shoulder.

Question 31

Deep branches of the cervical plexus are divided into what?

Answer 31

Medial and Lateral Series

Question 32

The Lateral series of the deep branches passes into what?

Answer 32

Posterior Triangle

Question 33

T/F: The lateral series of the deep branches consists of sensory branches and communicating branches.

Answer 33

False, consist of communicating branches and muscular branches.

Question 34

The spinal accessory nerve may receive communicating branches carrying fibers from where?

Answer 34

C2-C4

Question 35

T/F: Muscular branches are associated with four muscles.

Answer 35

True

Question 36

What muscles are the muscular branches associated with?

Answer 36

1. Sternocleidomastoid 2. Trapezius 3. Levator Scapula 4. Middle Scalene

Question 37

SCM receives what type of fibers?

Answer 37

Proprioception

Question 38

Where does SCM receive proprioceptive fibers from?

Answer 38

C2, (maybe C3)

Question 39

Trapezius receives what type of fibers?

Answer 39

Proprioception

Question 40

Where does Trapezius receive proprioceptive fibers from?

Answer 40

C3, C4, (possibly C2)

Question 41

Levator Scapula receives what type of fibers?

Answer 41

Motor and Sensory

Question 42

What is Levator Scapula innervated by?

Answer 42

C3 & C4

Question 43

Where does Middle Scalene receive fibers from?

Answer 43

C3 & C4

Question 44

The medial series of the deep branches passes into where?

Answer 44

Anterior Triangle

Question 45

T/F: The medial series of the deep branches consists of muscular branches and communicating branches.

Answer 45

True

Question 46

Describe the first communicating branch of the medial series of the deep branches?

Answer 46

Between vagus and loop between C1 and C2

Question 47

Describe the second communicating branch of the medial series of the deep branches?

Answer 47

3 or 4 gray rami communicans from the superior cervical ganglion to the upper four cervical nerves

Question 48

Describe the third communicating branch of the medial series of the deep branches?

Answer 48

Fibers from C1 communicating with the hypoglossal nerve, then separating from the hypoglossal to form the superior root of the ansa cervicalis

Question 49

Where are muscular branches sent to in the medial series of the deep branches?

Answer 49

1. Rectus Capitis Lateralis, C1 2. Rectus Capitis Anterior, C1, C2 3. Longus Capitis, C1-C3 4. Longus Colli, C2-C4

Question 50

What root level(s) is/are associated with Rectus Capitis Lateralis?

Answer 50

C1

Question 51

What root level(s) is/are associated with Rectus Capitis Anterior?

Answer 51

C1, C2

Question 52

What root level(s) is/are associated with Longus Capitis?

Answer 52

C1-C3

Question 53

What root level(s) is/are associated with Longus Colli?

Answer 53

C2-C4

Question 54

Branches from C2 and C3 combine to form what?

Answer 54

Inferior Root of the Ansa Cervicalis

Question 55

What does the Ansa Cervicalis supply?

Answer 55

1. Sternohyoid 2. Sternothyroid 3. Both bellies of Omohyoid

Question 56

The Phrenic Nerve is formed by which fiber levels?

Answer 56

C3, C4 & C5

Question 57

Which level contributes the most fibers to the phrenic nerve?

Answer 57

C4

Question 58

Where does the phrenic nerve run?

Answer 58

Descends through the neck, anterior to the anterior scalene muscle.

Question 59

What type of fibers are received by the phrenic nerve via the Cervical Ganglia?

Answer 59

Postganglionic Sympathetic Fibers

Question 60

What is the nerve supply to the diaphragm?

Answer 60

Phrenic Nerve

Question 61

What nerve is involved with the onset of hiccups?

Answer 61

Phrenic Nerve

Question 62

What is one suspected cause of hiccups related to chiropractic?

Answer 62

Subluxation

Question 63

Why is the phrenic nerve really unique evolutionarily?

Answer 63

It's initial location is very high up from it's innervation. **This is important because the life of a person who has a severed spinal cord is likely to be spared because breathing isn't inhibited (due to diaphragm function still being intact).