Cranial Nerves

Question 1

What nervous system are the CN and their ganglia associated with?

Answer 1

Peripheral Nervous System (PNS)

Question 2

Where do all CN originate (EXCEPT CN 11)?

Answer 2

Cranial Cavity

Question 3

What CN carry only sensory fibers?

Answer 3

CN 1, 2, and 8

Question 4

What CN carry only motor fibers?

Answer 4

CN 3, 4, 6, 11, and 12

Question 5

What CN carry mixed (motor and sensory) fibers?

Answer 5

CN 5, 7, 9, and 10

Question 6

Where do CN derive from?

Answer 6

Brain or Brainstem

Question 7

(T/F) Cranial Nerves are formed by the fusion of dorsal and ventral roots.

Answer 7

False

Question 8

(T/F) Cranial Nerves do not divide into dorsal and ventral primary rami.

Answer 8

True

Question 9

(T/F) CN 1 and 2 are not associated with sensory ganglia.

Answer 9

True

Question 10

What is the function of GSA fibers?

Answer 10

Sensation from somatic structures like skin and skeletal muscle, sensation from mucosal and nasal cavities, pharynx, esophagus, etc.

Question 11

What is the function of GVA fibers?

Answer 11

Senation from visceral structures of the head like the carotid body and carotid sinus, thoracic, and abdominal viscera.

Question 12

(T/F) Special sensory is not unique to cranial nerves?

Answer 12

False

Question 13

What is the function of special sensory fibers (SA)?

Answer 13

sensations from specialized receptors related to special senses like vision, hearing, equilibrium, test, smell.

Question 14

What CN are SA fibers located?

Answer 14

CN 1, 2, 7, 8, 9, and 10

Question 15

What is the function of GSE fibers?

Answer 15

Motor innervation to skeletal muscle

Question 16

Where are GSE fibers derived in the embryo?

Answer 16

Somite Mesoderm

Question 17

What is the function of GVE fibers?

Answer 17

Parasympathetic motor innervation to smooth muscle and glands

Question 18

What CN are the GVE fibers located?

Answer 18

CN 3, 7, 9, and 10

Question 19

What is the function of BE fibers?

Answer 19

Motor to skeletal muscle in the head

Question 20

Where are BE fibers derived in the embryo?

Answer 20

Branchial Mesoderm (pharyngeal arch)

Question 21

Of the 6 pharyngeal arches, which one is rudimentary with no function?

Answer 21

5th Arch

Question 22

What CN is within the 1st arch?

Answer 22

CN 5 V3; Mandibular portion of the Trigeminal Nerve

Question 23

What CN is within the 2nd arch?

Answer 23

CN 7 (Facial Nerve)

Question 24

What CN is within the 3rd arch?

Answer 24

CN 9 (Glossopharyngeal)

Question 25

What CN is within the 4th and 6th arches?

Answer 25

CN 10 (Vagus)

Question 26

GSA sensory neurons are _______ (cell type), and where are they located?

Answer 26

Pseudopolar; peripheral sensory ganglia

Question 27

GSE/BE motor neurons are ________ (cell type), and are located where?

Answer 27

Multipolar; brain motor nuclei

Question 28

What spinal cord segments do preganglionic sympathetic (GVA and GVE) fibers come from?

Answer 28

T1-T2

Question 29

Superior and Inferior Sensory Ganglia of CN 9 and 10 contain what what cell bodies?

Answer 29

GVA Sensory Cell Bodies

Question 30

Preganglionic spinal cord gray matter at T1-T2 contain what cell bodies?

Answer 30

GVE Motor Cell Bodies

Question 31

Where are the postganglionic sympathetic GVE Motor Cell bodies?

Answer 31

Superior Cervical Chain Ganglia

Question 32

What fibers are found in the brainstem motor nuclei of CN 3, 7, 9, and 10?

Answer 32

GVE Parasympathetic Preganglionic fibers

Question 33

Where are GVE motor cell bodies of postganglionic parasympathetic nerves found?

Answer 33

Terminal motor ganglia of the head

Question 34

Associate the following cranial nerves with their respective terminal motor ganglia:

1. CN 3 a. Otic Ganglion
2. CN 7 b. Ciliary Ganglion
3. CN 9 c. Intrinsic Ganglia of the Viscera of the
4. CN 10 thorax, foregut, and midgut
   d. Submandibular ganglion,
   Pterygopalatine ganglion

Answer 34

1. b
2. d
3. a
4. c