1.2.2 Cranial Nerve Intro

Question 1

Damage to which three cranial nerves can result in deficits in eye movement and diplopia?

Answer 1

CN III, IV, or VI

Question 2

What are the three possible components of a cranial nerve?

Answer 2

Sensory (afferent)

Motor (efferent)

Autonomic (efferent) - if autonomic is present in the cranial nerves, it is always preganglionic parasympathetic

Question 3

What is the name, function, location, fiber type and neuropathy of CN V?

Answer 3

Name: Trigeminal

Function: sensation of face and muscle innervation of mastication

Location: trigeminal ganglion and trigeminal motor nucleus

Fiber Type: both

Neuropathy: facial numbness and difficulty chewing

Question 4

The cranial nerves exit on what surface of the brain? How are they numbered?

Answer 4

Ventral; Rostral to Caudally starting with I and ending with XII

Question 5

Identify these 12 cranial nerves

Answer 5

Question 6

What are the five purely motor cranial nerves?

Answer 6

III - Oculomotor

IV - Trochlear

VI - Abducens

XI - Accessory

XII - Hypoglossal

Question 7

What is the name, function, location and fiber type of CN I?

Answer 7

Name: Olfactory

Fuction: Smell

Location: nasal epithelium, synapse in the olfactory bulb

Type: sensory

Question 8

What is the name, function, location, fiber type, and neuropathy of CN IX?

Answer 8

Name: Glossopharyngeal

Function: back of tongue, pharnyx, ear, stylopharyngeus m., parotid gland, parasympathetic to carotid body

Location: solitary nucleus, nucleus ambiguus

Fiber Type: Both

Neuropathy: loss of taste, mouth sensory loss, dry mouth

Question 9

What is the name, function, location and fiber type of CN VIII?

Answer 9

Name: Auditory/Vestibular

Function: balance and sound

Location: ear structures, synapse in brain stem

Fiber Type: sensory

Neuropathy: deafness and balance disorders

Question 10

What is the name, function, location and fiber type of CN VI?

Answer 10

Name: Abducens

Function: innervates muscles under eye

Location: synapse in pons, abducens nucleus

Fiber type: motor

Question 11

What are the cranial nerves that contain both somatic and motor compontents?

Answer 11

V - Trigeminal

VII - Facial

IX - Glossopharyngeal

X - Vagus

Question 12

What is the name, function, location, fiber type and neuropathy of CN XI?

Answer 12

Name: Spinal accessory nerve

Function: innervates SCM and trapezius

Location: in spinal cord around C1-5

Fiber type: motor

Neuropathy: inability to shrug shoulders, turn head

Question 13

What is the name, function, location, fiber type, and neuropathy of CN VII?

Answer 13

Name: Facial

Function: taste and some touch, facial expression, parasympathetic innervation of glands

Location: solitary nucleus (taste)/spinal trigeminal (touch), facial nucleus, superior salvatory nucleus

Fiber Type: Both

Neuropathy: Bell’s palsy (facial paralysis), loss of taste and gland function

Question 14

What is the name, function, location, fiber type and neuropathy of CN III?

Answer 14

Name: Oculomotor

Function: movement of eye and eye lid, parasympathetic control of pupil and lens

Location: motor neurons in brainstem nuclei

Fiber Type: motor

Neuropathy: drooping eyelid

Question 15

What is the name, function, location, fiber type, and neuropathy of CN XII?

Answer 15

Name: Hypoglossal

Function: intrinsic tongue mm (stick your tongue out)

Location: hypoglossal nucleus

Fiber type: motor

Neuropathy: tongue veers to one side when you stick it out

Question 16

What is the name, function, location and fiber type of CN II?

Answer 16

Name: Optic

Function: vision

Location: retina, synapse in the thalmus

Type: sensory

Question 17

What is the name, function, location, fiber type, and neuropathy of CN X?

Answer 17

Name: Vagus

Function: visceral sensation, mm of larnyx, pharnyx, and palate

Location: solitary nucleus/spinal trigeminal, nucleus ambiguus

Fiber Type: both

Neuropathy: Diminished gag, hoarseness, difficulty in swallowing

Question 18

What is the name, function, location and fiber type of CN IV?

Answer 18

Name: Trochlear

Function: Innervates the muscles of lens and eye

Location: synapse in the pons in trochlear nucleus

Fiber Type: Motor

Question 19

What are some of the mnemonics to remember the names of the cranial nerves?

Answer 19

Oh, Oh, Oh to touch and feel very good velvet, ah heaven

On Old Olympus Towering Top A French and German Viewed Some Hops

Oh, Oh, Oh to touch and feel a girls vagina, ahh heaven (found on internet… apologize for its offensive nature)

Olfactory, Optic, Oculomotor, Trochlear, Trigeminal, Abudens, Facial, Acoustic, Glossopharyngeal, Vagus, pinal Accessory, Hypoglosal

Question 20

What are the three sensory only cranial nerves?

Answer 20

I - Olefactory

II - Optic

VIII - Vestibulocochlear

Question 21

What is the mnemonic used to remember the fiber types (motor, somatic, or both) of the cranial nerves?

Answer 21

Some Say Marry Money But My Brother Says Big Boobs Matter Most