CNS-FA17-Occulomotor & Trochlear & Abducens nerve Nerves Flashcards

1
Q

The nucleus of the oculomotor nerve is located where?

A

At the level of the superior colliculus of the midbrain

On the ventral side of periaqueductal gray

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2
Q

Where do the neurons of the oculomotor nerve exit ?

A

Interpeduncular fossa

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3
Q

Where does the oculomotor nerve exit the crainium?

A

Supraorbital fissure

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4
Q

Which eye muscles does the oculomotor nerve innervate?

A

All except the Superior oblique(trochlear) and lateral rectus (Abducens)

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5
Q

What is the function of the lavator palpebrae superioris that separates it from the other eye muscles?

A

Lifts eyelid

*no action on the eye

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6
Q

T/F: Oculomotor nerve has general somatic efferent and General visceral efferent

A

True

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7
Q

What is nucleus that contains the preganglionic fibers of the oculomotor nerve?

A

Edinger-Westphal nucleus/ Accessory oculomotor

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8
Q

The the fibers of the parasympathetic component of the oculomotor nerve come from the edinger-westphal/accessory oculomotor go to?

A

Ciliary ganglion (synapse) —> postganglionic come out as short ciliary nerves —> constrictor papillae muscles of the iris and ciliary muscle

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9
Q

What are the ciliary muscles connected to that have a function of focusing the lens?

A

Zonular fibers

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10
Q

What are the functions of the parasympathetic component of the oculomotor nerve?

A

Control light that enters

Focus the lens

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11
Q

The oculomotor nerve splits into what two divisions?

A

Superior

Inferior

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12
Q

Which muscles are innervated by the superior division of the oculomotor nerve?

A

Levator palpebrae superioris

Superior rectus

Medial rectus

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13
Q

The inferior division of the oculomotor nerve innervates which muscles?

A

Inferior rectus

Inferior oblique

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14
Q

What are the two reflexes associated with the parasympathetic component of the oculomotor nerve?

A

Pupillary light

Accommodation (focus)

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15
Q

Pupillary light reflex:

T/F: Shining light into one eye, both pupils constrict.

A

True

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16
Q

Pathway for pupillary reflex?

A

Fibers from optic tract —> synapse in pretectal area in midbrain —> fibers split bilaterally passing into the edinger-weshphal nucleus —> ciliary ganglion —> constrictor pupillae muscles of iris

17
Q

Pathway of accommodation reflex?

A

Contraction of both ciliary muscles to bend lens –> Stimulus goes to visual cortex —> midbrain (edinger-westphal) —> ciliary ganglion —> ciliary muscle

18
Q

what does “Corticobulbar” mean

A

Tract travels from cortex to medulla (aka bulbar region)

Tract does not make it to spinal cord

19
Q

Nerve with nucleus at the level of inferior colliculus, ventrally located at the periacqueductal gray?

A

Trochlear nerve

20
Q

Where do the fibers of the trochlear nerve enter the orbit and innervates what muscles?

A

Superior orbital fissure

Superior oblique

21
Q

What is the only cranial nerve that exits dorsal and ALL fibers cross to CL side?

22
Q

T/F: Trochlear nerve has GSE and GSA

A

False: GSE only

23
Q

Cranial nerve with nucleus at the level of the midpons at facial colliculus ?

24
Q

Fibers of the Abducens nerve exit where?

A

Pontomedullary junction

fairly medial at the level of pyramids

25
The abducens nerve enters the orbit via which opening and innervates which muscles?
Supraorbital fissure Lateral rectus-abducts eye
26
T/F: Abducens nerve contains the parasympathetic component GSE
True
27
With the exception of this muscle all recti muscle have their origin on the medial side of the disc
Lateral rectus
28
Fully coordinated eye movement of: Inferior oblique
Up and in
29
Fully coordinated eye movement of: Medial rectus
Medially
30
Fully coordinated eye movement of: Superior oblique
Down and In
31
Fully coordinated eye movement of: Superior rectus
Up and out
32
Fully coordinated eye movement of: Inferior rectus
Down and out
33
Fully coordinated eye movement of: LAteral rectus
Laterally
34
Eye muscle action individually: Inferior oblique
Up and out
35
Eye muscle action individually: Superior oblique
Down and out
36
Eye muscle action individually: Superior rectus
Up and in
37
Eye muscle action individually: Inferior rectus
Down and in