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H&N > Eye Anatomy > Flashcards

Eye Anatomy Flashcards

1
Q

blood supply

A

ophthalmic artery & branches

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2
Q

venous drainage

A

ophthalmic veins

> cavernous sinus, pterygoid plexus, facial vein

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3
Q

general sensory

A

Va = ophthalmic

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4
Q

special sensory

A

II = optic

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5
Q

motor

A 
III = oculomotor
IV = trochlear
VI = abducens
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6
Q

blow out fracture >

A

bleed into maxillary sinus

‘trapping’ of extraocular muscles / (maxillary) cutaneous nerve damage

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7
Q

blow out presenation

A

bruising / pain etc
x looking up on affected side
numbness over cheek

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8
Q

what do eyelids consist of

A 
skin 
subcutaneous tissue
tarsal plate
muscles: LPS, orbicularis oculi 
glands: Meibomian, sebaceous
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9
Q

what is produced from Meibomian glands

A

oily
lipid rich
> x tear film spillage / evaporation

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10
Q

what is the function of orbital septum / tarsal plates

A

x superficial infection > pre-septal / post-septal (orbital cavity)

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11
Q

describe the route of spread of infection from the orbit to intracranial structures

A

orbital veins > cavernous sinus > pterygoid venous plexus > facial veins

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12
Q

what structures allow drainage of the tear film

A

lacrimal punctum > lacrimal canaliculus > lacrimal sac > nasolacrimal duct

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13
Q

what can happen after obstruction to blockage of the lacrimal drainage system

A

epiphora

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14
Q

fibrous tunic =

A

cornea

sclera

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15
Q

vascular tunic =

A

iris
ciliary body
choroid

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16
Q

retina =

A

pigmented layer

neural layer

17
Q

how is the eyeball maintained in position?

A

suspensory ligament
extraocular muscles
orbital fat

18
Q

describe the journey from light > optic nerve

A

light o> RGC > AP along visual pathway > optic nerve > occipital lobe (interpretation)

19
Q

causes of vision blurring

A 
cataracts
astigmatism = irregular corneal surface
presbyopia = x change in lens shape
shape of eye ball
retinal detachment
age-related macular degeneration
optic neuritis
20
Q

? => aqueous humour

A

ciliary processes (in ciliary body)

21
Q

aqueous humour route

A

post chamber > iridocorneal angle > pupil > ant chamber > trabecular meshwork > canal of Schlemm (drainage)

22
Q

glaucoma s&s

A

optic disc cupping

23
Q

acute angle closure glaucoma s&s

A

halos
nausea / vom
acute pain
irregularly shaped eye (oval)

24
Q

acute angle closure glaucoma treatment

A

pharmacological v IOP

surgical

H&N (8 decks)

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