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MD2S3: Anatomy 203 > Vestibulocochlear, Accessory and Hypoglossal Nerves > Flashcards

Vestibulocochlear, Accessory and Hypoglossal Nerves Flashcards

1
Q

Vestibulocochlear Nerve
Origin

A

Pontomedullary Groove lateral to Facial Nerve

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2
Q

Vestibulocochlear Nerve
Functions of each part

A

Vestibular Part: Balance, Equilibrium and Orientation
Cochlear Part: Hearing

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3
Q

Vestibulocochlear Nerve: Vestibular Part
Location of Vestibular Receptors

A

Semicircular Canals
Utricle and Saccule

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4
Q

Vestibulocochlear Nerve: Vestibular Part
Semicircular Canals respond to …

A

rotatory movements

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5
Q

Vestibulocochlear Nerve: Vestibular Part
Utricle and Saccule respond to …

A

linear movement
influence of gravitational pull

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6
Q

Vestibulocochlear Nerve: Vestibular Part
Fill out the Vestibular Nerve Pathway

A
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7
Q

Vestibulocochlear Nerve: Vestibular Part
Nuclei locations

A

Superior Vestibular Nucleus: Vestibular Area of Pons
Lateral Vestibular Nucleus: Lateral to Superior Nucleus
Medial Vestibular Nucleus: Vestibular Trigon in Medulla
Inferior Vestibular Nucleus: Lateral to Medial Nucleus

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8
Q

Vestibulocochlear Nerve: Vestibular Part
Function of Area 2

A

Interprets Spatial Position

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9
Q

Vestibulocochlear Nerve: Vestibular Part
Connections of Vestibular Nucleus

A

The Vestibular Nucleus connects to …
Inferior Cerebellar Peduncle to Archicerebellum
Spinovestibular Tract to Spinal Cord
Medial Longitudinal Bundle to 3rd, 4th, 6th and 11th Nerve Nuclei (Coordination of Extraoccular Muscles and Neck)

All efferent fibers

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10
Q

Vestibulocochlear Nerve: Vestibular Part
Damage Causes …

A

Nystagmus
Nausea
Vomiting
Vertigo
Unsteady Gait
Falling towads side of Lesion

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11
Q

Vestibulocochlear Nerve: Cochlear Part
Location of Auditory Receptors

A

Organ of Corti

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12
Q

Vestibulocochlear Nerve: Cochlear Part
Fill out the Cochlear Nerve Pathway

A
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13
Q

Vestibulocochlear Nerve: Cochlear Part
Damage to Cochlea/Cochlear Nerve causes …

A

Tinnitus
Deafness

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14
Q

Vestibulocochlear Nerve: Cochlear Part
What may cause damage to Cochlea or Cochlear Nerve?

A

Fracture of Middle Cranial Fossa
Cerebellopontine Angle Tumors

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15
Q

Accessory Nerve
Origin of Roots

A

Cranial Root: Lower Part of Nucleus Ambiguous
Spinal Root: Upper 4-5 Cervical Segments of Spinal Cord

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16
Q

Accessory Nerve
Which nerve does the Cranial Accessory nerve join?

A

Vagus Nerve

17
Q

Accessory Nerve
Fnction of Cranial Accessory Nerve and Vagus Nerve

A

Muscles of Pharynx: Pharyngeal Branch of Vagus Nerve
Muscles of Larynx: Recurrent Laryngeal Branch of Vagus Nerve

18
Q

Accessory Nerve
Cranial Accessory Nerve considered a branch of …

A

vagus nerve

19
Q

Accessory Nerve
Fill out Accessory Nerve Pathway

A
20
Q

Accessory Nerve
Function of Spinal Accessory Nerve

A

Supplies Sternocleidomastoid and Trapezius

21
Q

Accessory Nerve
Lesion of Nucleus Ambiguous affects ____ and causes ____

A

__X and XI nerves and Spinothalamic Tract__
__Avellis Syndrome__

22
Q

Accessory Nerve
Ipsilateral Lesion causes …

A

Palatine, Pharyngeal and Laryngeal Muscle Paralysis (Tensor Palati still functions because it is innervated by Trigeminal Nerve)
Uvula deivates to Contralateral Side of Lesion
Contralateral Loss of Pain and Temperature

23
Q

Hypoglossal Nerve
Function

A

Supplies Intrinsic and Extrinsic Muscles of Tongue except Palatoglossus

Palatoglossus is supplied by the Cranial Accessory Nerve

24
Q

Hypoglossal Nerve
Fill out Hypoglossal Nerve Pathway

A
25
Q

Hypoglossal Nerve
Effects of LMNL of Hypoglossal Nerve

A

Paralysis & Atrophy of Tongue on Same Side (Tongue deviates to side of the lesion)
Affected Side will show Fasciculations

26
Q

Hypoglossal Nerve
Effects of UMNL of Hypoglossal Nerve

A

Muscles of the Tongue receive double innervation from Corticonuclear Tract
Only Genioglossus is Unilaterally controlled by contralateral Corticonuclear tract causing Contralateral Tongue deviation

MD2S3: Anatomy 203 (31 decks)

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