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anat 316 > orbit and eye > Flashcards

orbit and eye Flashcards

1
Q

what is the bony orbit?

A

bilateral, symmetrical cavities containing the eyeballs and associated structures

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2
Q

what bones make up the superior bony orbit?

A

frontal bones

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3
Q

what bones makes up the medial orbit?

A

ethmoid bone and the lacrimal bone

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4
Q

what bones make up the deep orbit

A

sphenoid bone

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5
Q

what bone makes up the lateral orbit

A

zygomatic bone

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6
Q

what bone makes up the inferior bony orbit

A

maxilla

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7
Q

what nerves go through the superior orbital fissure

A

oculomotor nerve, trochlear nerve, ophthalamic division of trigeminal nerve, abducens nerve

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8
Q

what nerves go through the optic canal

A

optic nerve

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9
Q

what nerves go through the inferior orbital fissure

A

none!

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10
Q

what are the three lateral layers of the eye

A

outer fibrous layer, middle vascular layer, inner neural layer

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11
Q

what is in the outer fibrous layer of the eye?

A

sclera and cornea

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12
Q

what is in the middle vascular layer of the eye

A

iris, ciliary body, and choroid

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13
Q

what is in the inner neural layer

A

retina

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14
Q

what is the function of the cornea

A

to firstly retract the light entering the eye - directing light to the lens

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15
Q

what is the function of the sclera

A

supportive outer layer, attachment site of extraocular muscles, lubricates eye

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16
Q

what is the function of the limbus

A

transition zone btw the cornea and sclera

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17
Q

what is the combo of the iris, ciliary body, and choroid called?

A

uvea

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18
Q

what is the function of the iris

A

contains pupillary dilator and sphincter muscles to control pupil size

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19
Q

what is the function of the ciliary body?

A

to produce aqueous humour that nourishes avascular cornea, contains ciliary muscles, and helps focus lens using zonular fibers and ciliary muscles

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20
Q

what is the function of the lens?

A

to focus light on the retina

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21
Q

what do ciliary muscles, zonule, and lens look like when focusing on distant bjects

A

ciliary muscles would be relaxed, the zonule would be taut, and the lens would be flattened for focusing on distant objects

22
Q

what nervous system controls the sphincter pupillae?

A

the parasympathetic nervous system`

23
Q

what do the sphincter pupillae do?

A

contricts pupil when the sphincter pupilae is contracted

24
Q

are the sphicter pupillae muscles proximal or distal to the pupil?

A

proximal!

25
Q

what is the purpose of the choroid?

A

to nourish the retina and maintain eye temp and volume

26
Q

what is the purpose of the retina

A

captures light to send to the brain

27
Q

what is the the outer fibrous layer

A

sclera and the cornea

28
Q

what is in the middle vascular layer

A

iris, choroid, ciliary body

29
Q

what is in the inner layer

A

retina

30
Q

what chambers are in the anterior cavity of the eye

A

anterior and posterior chamber

31
Q

what chamber is in the posterior cavity of the eye

A

vitreous chamber

32
Q

where is the anterior chamber

A

btw cornea and the iris`

33
Q

what is the purpose of the anterior chamber

A

to contain the aqueus humour

34
Q

where is the posterior chamber

A

btw the iris and the lens

35
Q

what is the purpose of the posterior chamber?

A

to aid in production and circulation of aqueous humour

36
Q

what is the purpose of aqueous humour?

A

to main eye pressure

37
Q

what is the purpose of the vitreous chamber?

A

to contain vitreous humour

38
Q

what is the purpose of vitreous humour

A

to maintain shape of eye, to nourish the eye

39
Q

where is the vitreous chamber of the eye

A

behind the lens

40
Q

which extraocular muscles are on top of the eye?

A

superior rectus, trochlea, superior oblique

41
Q

what extraocular muscles are on the lateral and medial sides of the eye

A

the lateral rectus and the medial rectus

42
Q

what extraocular muscles are on the bottom of the eye?

A

inferiror oblique and inferior rectus

43
Q

what movement does the inferior oblique do?

A

moves the eyeball up and out

44
Q

what movement does the superior oblique do?

A

moves the eye down and out

45
Q

what movement does the superior rectus do?

A

moves eye up

46
Q

what movement does the lateral rectus do?

A

moves eye laterally

47
Q

what innervates the extraocular muscles?

A

the oculomotor nerve except it does not innervate the lateral rectus (this is the abducens nerve) and the superior oblique (this is the trochlear nerve)

48
Q

what is the lacrimal apparatus

A

system of glands and ducts that produces and drains lacrimal fluid

49
Q

what is lacrimal fluid?

A

fluid that lubricates eye surface, removes debris from eye, aka tears

50
Q

where is the lacrimal gland on the eye?

A

superior and lateral

51
Q

what structures does the lacrimal apparatus contain?

A

lacrimal gland, excretory lacrimal ducts, superior and inferior puncta, superior and inferior lacrimal canaliculi, lacrimal sac, and nasolacrimal duct
(LNL PEC)

52
Q

what structures of the lacrimal apparatus are medial?

A

puncta, canaliculi, lacrimal sac, nasolacrimal duct

anat 316 (22 decks)

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