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

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?

A

Trochlear

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 ?

A

Abducens

24
Q

Fibers of the Abducens nerve exit where?

A

Pontomedullary junction

fairly medial at the level of pyramids

25
Q

The abducens nerve enters the orbit via which opening and innervates which muscles?

A

Supraorbital fissure

Lateral rectus-abducts eye

26
Q

T/F: Abducens nerve contains the parasympathetic component GSE

A

True

27
Q

With the exception of this muscle all recti muscle have their origin on the medial side of the disc

A

Lateral rectus

28
Q

Fully coordinated eye movement of:

Inferior oblique

A

Up and in

29
Q

Fully coordinated eye movement of:

Medial rectus

A

Medially

30
Q

Fully coordinated eye movement of:

Superior oblique

A

Down and In

31
Q

Fully coordinated eye movement of:

Superior rectus

A

Up and out

32
Q

Fully coordinated eye movement of:

Inferior rectus

A

Down and out

33
Q

Fully coordinated eye movement of:

LAteral rectus

A

Laterally

34
Q

Eye muscle action individually:

Inferior oblique

A

Up and out

35
Q

Eye muscle action individually:

Superior oblique

A

Down and out

36
Q

Eye muscle action individually:

Superior rectus

A

Up and in

37
Q

Eye muscle action individually:

Inferior rectus

A

Down and in

Neuroanatomy (8 decks)

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