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Neuroanatomy Lecture > Midbrain > Flashcards

Midbrain Flashcards

1
Q

What does the dorsal midbrain control?

A

visual and auditory reflexes, and the extraocular muscles

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2
Q

What does the tectospinal tract control?

A

body and ocular reflexes, and pupillary dilation

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3
Q

Where does the tectospinal tract originate at?

A

the tectum

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4
Q

What does the ventral midbriain control?

A

voluntary motor tracts to control the brain storm and spinal cord motor nuclei (crus cerebri) and some extraocular muscles

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5
Q

What is the tectum made up of?

A

the rostral and caudal colliculi

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6
Q

Where is the cerebral aqueduct located?

A

in betweem the tectum and tegmentum

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7
Q

What is located in the tegmentum?

A

reticular formation, motor and sensory nuclei

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8
Q

What motor nuclei are located in the midbrain?

A

nuclei of CN III and IV

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9
Q

What side of the body does the right nuclei of the trochlear nerve project to?

A

the left side

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10
Q

What motor nucleus is located in the medulla oblongata?

A

motor nucleus of the abducent

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11
Q

What are the extraocular muscles of the eye?

A

dorsal rectus, dorsal oblique, medial rectus, ventral oblique, ventral rectus, lateral rectus, retractor bulbi, and levaotr palpebral

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12
Q

What are the intraocular muscles of the eye?

A

pupillary sphincter muscles and ciliary muscles

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13
Q

What muscles does the occulomotor nerve control?

A

dorsal rectus, medial rectus, ventral oblique, ventral rectus, levator palpebral, and pupillary sphincter muscles

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14
Q

What muscle does the trochlear nerve control?

A

dorsal oblique

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15
Q

What muscles does the abducent nerve control?

A

the lateral recuts and retractor bulbi

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16
Q

What could a lesion to the midbrain cause?

A

motor and sensory deficits and coma

17
Q

What would a lesion to the oculomotor nerve cause?

A

lateral strabismus

18
Q

What muscles are affected in a patient that has lateral strabismus?

A

the dorsal and medial rectus

19
Q

What would a lesion to the abducent nerve cause?

A

medial strabismus

20
Q

What muscles are affected in a patient that has medial strabismus?

A

the lateral recuts and retractor bulbi

21
Q

What does injury to the trochlear nerve cause?

A

the dorsal oblique is not functional

22
Q

Which cranial nerve causes a lack of pupillary reflex?

A

the oculomotor

23
Q

What muscle is not functional in ptosis and what CN is this associated with?

A

levator palpebrae superioris - oculomotor

Neuroanatomy Lecture (17 decks)

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