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Anatomy > Cranial Nerves > Flashcards

Cranial Nerves Flashcards

1
Q

What are the 12 cranial nerves in order?

A

On Old Olympus’ Towering Top A Free Viker Gazed Victoriously At Him (olympus, that is)

Olfactory

Optic

Oculomotor

Trochlear

Trigeminal

Abducens

Facial

Vestibulocochlear

Glossopharyngeal

Vagus

Accessory

Hypoglossal

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2
Q

What are the modalities used to classify cranial nerves?

A

Motor and Sensory

Motor: skeletal and visceral (smooth ms)

Sensory: general, special, visceral

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3
Q

Which nerves are purely sensory?

A

Olfactory n (CN I)

Optic (CN II)

Vestibulocochlear (CN VIII)

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4
Q

Purely motor nerves

A

Trochlear n (CN IV)

Abducens (CN VI)

Accessory (CN XI)

Hypoglossal (CN XII)

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5
Q

Mixed nerves

A

Oculomotor (CN III)

Trigeminal (CN V)

Facial (CN VII)

Glossopharyngeal (CN IX)

Vagus (X)

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6
Q

1 sensory Characteristics of Olfactory nerve (CN1)

A

Olfactory sensory neurons in olfactory epithelium (transmitted via olfactory bulb)

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7
Q

1 clinical correlate of Olfactory nerve (CN1)

A

Damage results in anosmia (loss of smell sensation); due to whiplash

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8
Q

Foramen through which olfactory nerve passes

A

Cribiform plate

https://teachmeanatomy.info/head/cranial-nerves/olfactory-cni/

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9
Q

3 characteristics of Olfactory N (CN1)

A

Sensory neurons in olfactory epithelium >> signal transmitted via olfactory bulb

Damage results in anosmia (loss of smell sensation)

Nerve passes through cribiform plate

https://teachmeanatomy.info/head/cranial-nerves/olfactory-cni/

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10
Q

1 sensory characteristic of Optic n (CN2)

A

Photoreceptors (rods +cones) in retina

https://teachmeanatomy.info/head/cranial-nerves/optic-cnii/

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11
Q

Clinical correlate of Optic nerve

A

Damage usually occurs around eyeball; disorders involve the retina

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12
Q

Foramen thru which Optic nerve (CN2) passes

A

Optic canal

https://teachmeanatomy.info/head/cranial-nerves/optic-cnii/

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13
Q

Characteristics of Optic nerve (CN2)

A

Passes through optic canal

Photoreceptors in retina (rods + cones)

Damage typically occurs around eyeballs; disorders involve the retina

https://teachmeanatomy.info/head/cranial-nerves/optic-cnii/

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14
Q

Sensory characteristic of Vestibulocochlear nerve (CN8)

A

Sensory component (Vestibular): vestibular apparatus in ear detects gravity/acceleration >> vestibular ganglion

Auditory component (Cochlear): tympanic membrane (receives sound waves) >> cochlea ganglion via hair cells

https://teachmeanatomy.info/head/cranial-nerves/vestibulocochlear/

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15
Q

Clinical correlate of Vestibulocochlear n (CN8)

A

Vestibular portion: motion sickness

Cochlear portion: ear ache due to outer ear infection (e..g. swimmer’s ear)

https://teachmeanatomy.info/head/cranial-nerves/vestibulocochlear/

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16
Q

Foramen thru which Vestibulocochlear n (CN8) passes

A

Internal Auditory Meatus

https://teachmeanatomy.info/head/cranial-nerves/vestibulocochlear/

17
Q

Trigeminal nerve (CNV) Sensory + Motor characteristics

A

3 divisions: V1 - opthalmic (sensory only)

V2 - maxillary (sensory only)

V3 - mandibular (sensory + motor)

https://teachmeanatomy.info/head/cranial-nerves/trigeminal-nerve/

18
Q

Foramina through which Trigeminal nerve (CNV) branches pass

A

Opthalmic division (V1): Superior orbital fissure

Maxillary division (V2): Foramen rotundum

Mandibular division (V3): Foramen ovale

https://teachmeanatomy.info/head/cranial-nerves/trigeminal-nerve/

19
Q

Clinical correlate of Trigeminal nerve (CNV)

A

Fractures of facial bones can = damage to peripheral branches of CNV divisions, resulting in loss of sensation to that area

e.g. loss of sensation to teeth due to damage to inf alveolar n>>br of maxillay n (CNV2)

20
Q

Motor characteristics of Trigeminal n (CNV)

A

Mandibular division (CNV3) = motor fibers to muscles of mastication (tempralis, masseter, lateral + medial pterygoids) + MATT (mylohyoid, ant belly of digastric, tensor veli palatini, tensor tympani)

https://teachmeanatomy.info/head/cranial-nerves/trigeminal-nerve/

21
Q

Parasympathetic characteristics of Trigeminal n (CNV)

A

Anatomy (9 decks)

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