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Ocular anatomy > Occular nerve innervation > Flashcards

Occular nerve innervation Flashcards

1
Q

What are the orbital motor nerves

A

Oculomotor (III) nerve

Trochlear (IV) nerve

Abducent nerve (VI) nerve

Facial nerve (VII) nerve

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2
Q

What are the orbital sensory nerves

A

Optic (II) nerve

Trigeminal (V) nerve

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3
Q

What efferent nerve fibres does the oculomotor nerve (CNIII) contain

A

Somatic nerve fibres

Parasympathetic nerve fibres

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4
Q

What are the two motor nuclei of oculomotor nerve

A

CN III nuclues

Edinger-Westphal nuclues

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5
Q

What are the two branchs of the oculomotor nerve

A

Superior division:
LPS and SR muscle

Inferior divion:
IR, IO and MR

Efferent parasympathetic fibres (Edinger-Westphal nuclues)
- ciliary muscles
- sphincter pupillae muscles

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6
Q

What does the trochlear nerve (CN IV) innervate

A

Superior oblique muscle only

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7
Q

Which nerve is the thinnest and longest nerve

A

trochlear nerve ( CN IV)

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8
Q

What does the abducent nerve (CN VI) innervate

A

Lateral rectus muscle

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9
Q

Which nerve is vulnerable to damage by the sharp edge of bones

A

Abducent nerve (CN VI)

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10
Q

What is the orbital region of the facial nerve

A

Temporal

Zygomatic

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11
Q

What does the temporal and upper buccal branch of the facial nerve innervate

A

Temporal:
- orbicularis oculi
- occipito- frontalis msucle
- corrugator supercilii

Upper branch branch
- procerus

Failure of this nerve causes incorrect lid closure, zygomatic also innervates ig

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12
Q

What does the parasympathetic nerve fibres from facial nerve innervate

A

Lacrimal gland

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13
Q

What does the sympathetic nerves of the facial nerve supply

A

Vessels of the lacrimal gland

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14
Q

What does the optic nerve do

A

Send afferent visual information from retina to brain

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15
Q

What arethe three divison of the trigeminal nerve ( CN V)

A

Ophthalmic, maxillary and mandibular

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16
Q

What type of nerve is trigemenial nerve (CN V)

A

Sensory nerve

17
Q

What does the opthalmic divion of CN V divide into

A

Frontal, nasociliary and lacrimal branch

18
Q

What does the frontal branch of the trigeminal nerve (CN V) divide into and which structures does itsupply

A

Supra orbital and trochlear nerve

Supplies
- forehead n scalp
- upper eyelid
- conjunctiva

19
Q

What does the nasociliary branch of the trigeminal nerve (CN V) divide into and which structures do it supply

A

2 long ciliary nerve
- sclera and iris dilator and cornea

Short ciliary nerve
- cornea and choroid

Both carries sympathetic fibres

Infratrochlear nerve
- skin of nose, eyelids, conjunctiva, carruncle, canaliculi and lacrimal sac

20
Q

What does the lacrimal branch of the trigeminal nerve (CN V) supply

A

Lacrimal gland

Upper eyelid

Conjunctiva

21
Q

What muscles does the autonomic nervous system innervate

A

Iris
Ciliary
Smooth muscle of eyelids
Choroidal and conjunctival blood vessels
Lacrimal gland

22
Q

Where does the sympathetic fibres come from

A

Superior cervical ganglion

23
Q

How does the sympathetic nervous system suuply to orbit

A

Short ciliary muscles: supply orbital vessels

Long ciliary nerves: iris dilator and anerior globe

Joins oculomotor:
Muller’s muscle

24
Q

What are the functions of the sympathetic nervous system

A

Vaso-constriction

Pupil dilation

Lid retraction

Basal secretion of lacrimal gland

This system prepares the body for an emergency

25
Q

How does the parasympathetic nervous system sppuly the orbit

A

Ciliary ganglion pathway:
- for cilary muscle and sphincter pupillae ( from edinger-westphal nuclues)

Pterygopalatine ganglion pathway:
-for lacrimal gland

26
Q

What are the functions of the parasympathetic nervous system

A

Ciliary muscle accommodation

Iris sphincter muscle, miosis

Lacrimal gland

This system helps to restore and conserve energy

Ocular anatomy (15 decks)

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