Midbrain HY Flashcards

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1
Q

locus ceruleus - location, function?

A
  • rostral pons at midbrain junction
  • medial

-supplies entire CNS with noradrenergics –> attention, vigilance

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2
Q

trochlear nucleus - location, function, lesion?

A
  • caudal midbrain
  • medial
  • only nerve that exits dorsally

-innervates superior oblique (somatic motor)

Lesion:

  • no dramatic loss
  • may have trouble descending stairs
  • may have slight diplopia while reading
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3
Q

occulomotor nucleus - location, function, lesion?

A
  • rostral midbrain
  • medial

-innervates levator palpebrae superioris, inf./sup./medial rectus, inf oblique (somatic motor)

Lesion:

  • lateral gaze (MLF)
  • ptosis
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4
Q

Edinger-Westphal Nucleus - location, functin, lesion?

A
  • rostral midbrain
  • medial
  • parasympathetic preganglionic cells
  • innervates sphincter pupillae, ciliary muscle (visceral motor)

Lesion:
-dilated pupil, unresponsive to light

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5
Q

substantia nigra

A
  • rostral midbrain
  • contains dopamine neurons
  • lose 80% = Parkinson’s Disease
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