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COM - Neuro Test 3 > Brainstem Morphology - 4/25 Stephens > Flashcards

Brainstem Morphology - 4/25 Stephens Flashcards

1
Q

Lesions of the MLF result in what?

Characteristics?

A

Internuclear Ophthalmoplegia

Abnormal horizontal gaze in direction opposite side of the lesion

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2
Q

Unilateral lesions of the MLF result in impairment of what muscle?

What condition?

A

Loss of adduction - middle rectus m. Of the ipsilateral eye

Nystagmus of the AB-ducting eye

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3
Q

Where do most corticobulbar fibers descend from?

Course through what?

Decussate Where?

Innervate what?

A

Head region of Precentral gyrus

Genu of internal capsule and cerebral peduncles

Lower pons bw CN 5 and 6 (uncrossed at and above CN 5)

Somatic motor nuclei

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4
Q

Lesions of the CBT above the decussation may result in what?

A

Contralateral CN palsy -> supranuclear facial palsy

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5
Q

Supranuclear Facial palsy has what clinical manifestations?

A

Paralysis of the contralateral lower quadrant of the face (facial droop, cannot smile)

Upper quadrant of face unaffected

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6
Q

Trochlear nerve brainstem level?

A

Midbrain

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7
Q

Glossopharyngeal nerve brainstem level?

A

Medulla Oblongata

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8
Q

Facial nerve brainstem level?

A

Pontomedullary Sulcus

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9
Q

Vagus nerve brainstem level?

A

Medulla Oblongata

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10
Q

Optic nerve brainstem level?

A

Diencephalon

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11
Q

Trigeminal nerve brainstem level?

A

Pons

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12
Q

Hypoglossal nerve brainstem level?

A

Medulla Oblongata

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13
Q

Abducens nerve brainstem level?

A

Pontomedullary Sulcus

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14
Q

Oculomotor nerve brainstem level?

A

Midbrain

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15
Q

Vestibulocochlear nerve brainstem level?

A

Pontomedullary Sulcus

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16
Q

Spinal Accessory nerve brainstem level?

A

Medulla Oblongata

17
Q

Lesion of what CN causes external strabismus?

A

Oculomotor nerve

18
Q

Paralysis of muscles of mastication is due to lesion of what nerve?

A

CN 5

19
Q

Internal strabismus due to what CN lesion?

A

Abducens (6)

20
Q

Lesion of the Nucleus Ambiguus results in what symptoms?

What special symptom?

A

Dysarthria, dysphagia, hoarseness

Deviation of uvula away from affected nucleus

21
Q

Lesion of Hypoglossal nucleus has what symptoms?

What special symptom?

A

Ipsilateral paralysis and atrophy of the intrinsic muscles of the tongue

Tongue deviates towards side of lesion

22
Q

What is the critical link in conjugate movements of the eyes that connects the Oculomotor nucleus with the Abducens nerve?

A

MLF (Medial Longitudinal Fasciculus)

23
Q

Olfactory nerve brainstem level?

A

Telencephalon

24
Q

What structures are located in the spinal cord?

A

Spinal nerves
LSTT
FG, FC
LCST

25
Q

What does the MLF convey?

A

Vestibular influences to CN 3, 4, and 6

COM - Neuro Test 3 (17 decks)

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