Cantrell SG Cranial nn.

Question 1

What is the Difference between the origin of spinal nerves and cranial nn.?

Answer 1

Spinal:
Spinal Cord

Cranial:
Brain and Brainstem

Question 2

What is the Difference in function of spinal nn. and cranial nn.?

Answer 2

Spinal:
ALL are MIXED

Cranial:
Some are Motor and Sensory ONLY

Question 3

Which cranial nerves are sensory only?

Answer 3

1, 2, 8

Question 4

Which cranial nerves are motor only?

Answer 4

3, 4, 6, 11, 12

Question 5

Which cranial nerves are mixed?

Answer 5

5, 7, 9, 10

Question 6

What is the difference in functional components of cranial nn. vs. spinal nerves?

Answer 6

Spinal Nerves don’t have SA or BE fibers

Question 7

What is the difference in location of sensory cell bodies of spinal nn. vs. cranial nn.?

Answer 7

Spinal:
Dorsal Root Ganglion

Cranial:
Peripheral Cell ganglia

Question 8

What are the 5 peripheral SENSORY ganglia of spinal nn.?

- associated nn.

Answer 8

• Trigeminal (V)
• Geniculate (VII)
• Vestibular ( VIII)
• Spiral (VIII)
• Superior and Inferior (IX)
• Superior and Inferior (X)

Question 9

What spinal nerves are sensory but have no associated ganglia?

Answer 9

1 and 2

Question 10

What is the difference in location of motor cell bodies for spinal nn. vs. cranial nn.?

Answer 10

Spinal:
- Spinal cord gray matter

Cranial:
- Brainstem Nuclei (embedded in brainstem)

Question 11

What is the difference in location of sympathetic fibers in spinal nn. and cranial nn.

Answer 11

Spinal:
T1 - L2

Cranial:
NONE (must steal fibers from T1 and a little T2)

Question 12

T or F: the cervical part of the sympathetic chain has white rami?

Answer 12

FALSE, no fibers are getting ON the chain here

Question 13

What is the difference in location of parasympathetic fibers in spinal and cranial nn.?

Answer 13

Spinal:
S2-S4

Cranial:
3, 7, 9, 10

Question 14

What is the difference in GSE and BE fibers?

Answer 14

• BE fibers innervate muscles derived from the pharyngeal arch mesoderm
• GSE = everything Else

Question 15

What is the function of the 3 sensory only cranial nn.?

Answer 15

1 - olefactory - smell
2 - optic - sight
8 - vestibulocochlear - EQ and hearing

Question 16

What is the ONLY type of fiber carried by motor only neurons?
- What is the exception

Answer 16

• GSE (3, 4, 6, 11, 12)

- GSE and GVE (3)

Question 17

What cranial nerve innervates the pharyngeal constrictors?

- Fiber type?

Answer 17

• Phanyngeal Branches (CN X)

- BE fibers

Question 18

What pharyngeal arch are the pharyngeal contrictors derived from?

Answer 18

• 4/6th

- you know this because they’re innervation is CN X

Question 19

What arches are the longitudinal pharyngeal muscles are derived from, and what is their innervation?

• Fiber type?

Answer 19

Arch 4/6 = CN X

• Salpingopharyngeus
• Palatopharygeus
• **Arch 3 = CN IX
• Stylopharyngeus (ONLY PART OF PHARYNX not form 4/6)

ALL are BE fibers from these two nn.

Question 20

What Fiber type travels from CN XI to innervate trapezius and SCM?

Answer 20

GSE

Note: this is the only fiber type that the accesory nn. has

Question 21

T or F: the digastric muscles are derived from the same pharyngeal arch

Answer 21

FALSE, Anterior Digastric is from arch 1 (CN V3), Posterior digastric is from arch 2 (CN VII)

**THESE ARE BE FIBERS

Question 22

T or F: ALL muscles of the larynx are innervated by BE fibers.

Answer 22

True, all muscles get contribution from branches of CN X

Question 23

What is the ONLY muscle to come from the 3rd pharyngeal arch?

Answer 23

Stylopharngeus m.

Question 24

List of Muscles we’ve learned that recieve BE innervation from a cranial nn.

Answer 24

Pharyx
- All constrictors (X)

Longitudinal mm.

• Salpingopharygeus (X)
• Palatopharyngeus (X)
• Stylopharyngeus (IX)*
• ALL MUSCLE of the larynx
• Digastrics - anterior (V3), posterior (VII)

Question 25

Know Relationships of Hypoglossal

Answer 25

Know Relationships of Hypoglossal