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Yr 2 Anatomy > anatomy of the eye and orbit > Flashcards

anatomy of the eye and orbit Flashcards

1
Q

3 coats of the eye

A

fibrous
vascular
sensory

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2
Q

what is the fibrous coat made from
and what structures are included in it

A

collagen

sclera and cornea

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3
Q

whats included in vascular coat x3

A

iris
ciliary body
choriod

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4
Q

whats included in sensory coat

A

retina

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5
Q

whats the ora serrata

A

serrated edge of retina

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6
Q

type of collagen in parts of fibrous coat

A

sclera- irregular and thick
cornea- uniform and fine

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7
Q

what part of the eyeball do muscles attatch to

A

sclera

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8
Q

what suspends the lens
and produces AH

A

ciliary body

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9
Q

what does the choriod do

A

Supplies blood to outer layers of retina

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10
Q

ant vs post segment position and liquid type

A

anterior segment- infront of lens and contains Aqueous Humor(AH) which is WATERY

posterior segment- behind lens and contains Vitreous Humor(VH) which is a GEL

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11
Q

what attaches lense to ciliary body

A

zonules

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12
Q

purpose of AH and VH

A

AH- maintains intraocular pressure

VH- cushions retina

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13
Q

further chambers in anterior segment
where they sit

A

Anterior chamber (AC) in front of iris

Posterior chamber (PC) behind iris but in front of the lens

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14
Q

route of AH:
what helps with drainage
where is it absorbed, what angle
where is it absorbed to

A

trabecular meshwork

in canal of schlem at angle of anterior chamber

veins

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15
Q

what gland is found in eyelid
and what is it encapsulated by

A

meibomian gland
in tarsal plate

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16
Q

what is the conjuctiva

A

thin vascular membrane that covers inner surface of eyelids and loops back over sclera

DOES NOT COVER CORNEA

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17
Q

nerve supply to lacrimal gland

A

parasympathetic from facial nerve

18
Q

tear drainage

A

through punctae on the medial side of each eyelid

into lacrimal sac

Then through nasolacrimal duct

into inferior meatus of nose

19
Q

imotor innervation: ntrinsic vs extrinsic muscles

A

Intrinsic muscles – control pupil diameter & lens curvature

Extrinsic muscles - move
the eye.

20
Q

motor innervation: 3 intrinsic muscles
what they do
nerve supply

A

oculomotor:
1. Ciliaris muscle - lens
2. Constrictor pupillae

Sympathetic:
3. Dilator pupillae

21
Q

motor innervation: were do the recti muscles arise fom

A

annular fibrous ring

22
Q

see presentation for muscle diagram

A
23
Q

motor innervation: what muscle opens/closes eyelids

A

opens- LPS
closes- obicularis oculi

24
Q

motor innervation: 3 nerves that supply extrinsic muscles
what do they supply

A

oculomotor III- (3 things to remember)
all recti (except lateral)
inf oblique
LPS

trochlear IV- superior oblique

abducent VI- lateral rectus

25
Q

motor innervation: what nerve supplies superior oblique

A

trochlear VI

26
Q

motor innervation: what nerve supplies lateral rectus

A

abducens VI

27
Q

motor innervation: what nerve supplies all eye muscles except SO and LR

A

occulomotor III

28
Q

motor innervation: what nerve supplies LPS

A

oculomotor III

29
Q

where do the cranial nerves supplying eye leave skull

A

optic- optic foramen
oculomotor, abducens, trochlear- sup orbital fissure

30
Q

sensory innervation: what nerve supplies general sensory

and fissures it goes through

A

trigeminal 2 branches:

V1 ophthalmic- upper eyelid and eye ball- sup orbital fissure

V2 maxillary- inf orbital fissure

31
Q

what main artery supplies eye
what is it a branch of
what foramen does it enter through

A

ophthalmic

ICA

optic foramen- alongside optic nerve

32
Q

what branch of ophthalmic artery supplies inner retina

how does it travel

A

central retinal artery

within optic nerve

33
Q

what branches of ophthalmic supply the posterior choroid and outer retina

A

Short posterior ciliary arteries

34
Q

what branch of opthalmic artery supplies the
anterior choroid, ciliary body and iris

A

Long posterior ciliary arteries

35
Q

what veins drain the cavernous sinus

A

sup and inf ophthalmic veins

36
Q

what does the eye develop from

A

neural tube

37
Q

where do optic vesicles grow from

A

from diencephalic part of neural tube towards
surface ectoderm.

38
Q

steps in formation of optic vesicle x4

A

optic vesicles

lens placode

optic cup

2 layered optic cup

39
Q

what does ectoderm form in eye

A

eyelids, conjunctiva, corneal epithelium

first layer so outermost

40
Q

what does mesenchyme form in eye

A

choroid, stroma of cornea, sclera and
extraocular muscles.

main middle stuff

41
Q

what does lens fibres form from

A

epithelium of lens vesicle & later loose
their nucleii.

Yr 2 Anatomy (26 decks)

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