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Neuroanatomy > Oculomotor CNIII > Flashcards

Oculomotor CNIII Flashcards

1
Q

What is the fiber type(s) of the oculomotor nerve?

A

Motor: General Somatic Efferent and General Visceral Efferent

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2
Q

The cell bodies of the oculomotor nerve lie in the _____.

A

Oculomotor nuclear complex

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3
Q

Where is the oculomotor nuclear complex located?

A

Ventral to the cerebral aqueduct at the level of the superior colliculus (midbrain)

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4
Q

The fibers of the oculomotor nerve course through the _____ and emerge into the _____. They course through the _____ and then enter the orbit via the _____.

A

Midbrain tegmentum; interpeduncular fossa/cistern;cavernous sinus; superior orbital fissure

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5
Q

The nuclear complex consists of the _____ and _____

A

Edinger-Westphal nucleus and Oculomotor nucleus

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6
Q

Edinger-Westphal nucleus has what kind of fibers types?

A

Preganglionic parasympathetic and postganlionic

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7
Q

Edinger-Westphal nucleus: Preganglionic parasympathetic cell bodies send fibers (most superficial in the nerve) to the _____ in the orbit. From here the postganglionics course to the smooth muscles of _____ (lens thickening) and _____ muscle of the iris (pupillary constriction)

A

Ciliary ganglion; ciliary body; sphincter pupillae

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8
Q

Oculomotor nucleus consists of individual _____ for each muscle.

A

Subnuclei

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9
Q

The axons of the oculomotor nucleus project to the _____ skeletal muscles of the eye.

A

Extraocular

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10
Q

What are all the extraocular muscles of the eye innervated by the oculomotor nucleus? (4) Which muscle is the only skeletal muscle innervated by this nerve that is NOT extraocular?

A 
Superior rectus m. 
Medial rectus m. 
Inferior rectus m. 
Inferior oblique m. 
NOT: Levator palpebrae superioris m.
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11
Q

What is the action of Superior rectus m. ?

A

Elevation of the eyeball

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12
Q

What is the action of Medial rectus m. ?

A

Adduction of the eyeball

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13
Q

What is the action of Inferior rectus m.

A

Depression of the eyeball

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14
Q

What is the action of Inferior oblique m. ?

A

Excyclotorsion (Outward rotation)

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15
Q

What is the action of Levator palpebrae superioris m. ?

A

Raise upper eyelid

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16
Q

What is the clinical relevance if there is an lesion on Levator palpebrae superioris m. ?

A

Ptosis: Drooping of the eye/ Upper eyelids drop

17
Q

What is Lateral/external strabismus, and what cause this?

A

Deviation due to unopposed Lateral rectus m. and Superior oblique m.

18
Q

What is Diplopia?

A

Double vision

19
Q

What are the 2 muscles that Edinger-Westphal innervate?

A

Sphincter pupillae m. and Ciliary m.

20
Q

What is the action of sphincter pupillae m.? What type of muscle is this?

A

Pupil constriction; Smooth muscle (Parasympathetic)

21
Q

What is Mydriasis and what is the cause?

A

Dilated pupil and light sensitive; dysfunctional sphincter pupillae m. (Parasympathetic)

22
Q

What is Cycloplegia and what is the cause?

A

Paralysis of ciliary m. Loss of near response (Eyes cannot focus on nearby objects)

23
Q

The nucleus of the Oculomotor N. ( both Edinger-Westphal and Oculomotor) are located where?

A

Tegmentum of rostral midbrain

24
Q

Specifically, what is the fiber classification of Edinger-Westphal?

A

General Visceral Efferent (Smooth muscle)

25
Q

Specifically, what is the fiber classification of Oculomotor nerve?

A

General Somatic Efferent (Skeletal muscles)

26
Q

What types of nerve fibers are carried in Edinger-Westphal?

A

Parasympathetic

27
Q

In general, what are the function of oculomotor nerve?

A
  • Eyelid and eyeball movement
  • Controls muscles responsible for the precise movement of eyes or visual tracking or fixation of objects.
  • Adjust the amount of light entering the eye
  • Adjust focus
  • Changes pupil and lens shape

Neuroanatomy (5 decks)

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