Globe, Ocular tunics, and cornea, limbus and sclera Flashcards

1
Q

Identify the different layers of the globe and structures that form them

A
Globe- eye ball
Ocular tunics- outer, middle, inner
Outer: contains cornea/sclera
Middle: uvea (iris, ciliary body, choroid)
Inner: retina
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2
Q

Appreciate the purpose and functions of the eye as an organ

A

Globe of the eye receives light in the cornea, focused on the lens back to the retina, the optic nerve relays the information to the brain

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3
Q

Recognize the different cell and tissue types in the cornea and how they function to maintain clarity and protect the interior structures of the globe.

A

limbus
highly organized stroma, able to withstand continual insult
avascular
anterior chamber contains the aqueous humor (clear)

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4
Q

eye

A

organ of sight

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5
Q

fibrous tunic

A

outer coat of the eye; includes the cornea (transparent) and the sclera (opaque)

Made up of dense CT; Cornea- holds content of eye, allows light to come in & refracts light

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6
Q

uvea

A

composed of the iris, ciliary body, and the choroid

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7
Q

cornea

A

transparent structure, bends light rays toward the center of the eye

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8
Q

sclera

A

opaque area around cornea; “white of the eye”

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9
Q

vascular tunic

A

Choroid=posterior uvea
i. serves to nourish/remove waste materials from retina and shields light from outside; enhances light through cornea

Iris and ciliary body= anterior uvea
i. both richly vascular; supports inner components of eye
ii. aqueous bathes lens moves through 2 anterior chamber back to ciliary body and builds up a pressure keeping it firmly distended
iii. CB anchors lens & provides blood-aqueous barrier
iv. iris=most anterior part= modified flap of CB -> vascular, has muscle (same in CB)
1. muscle in iris controls amount of light going back
(w/ light pupil closes, dark it opens)

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10
Q

neurosensory tunic

A

composed of the retina, inner epithelia, optic nerve
a. CNS
b. Firmly establishes eye as anterior extension of CNS
(diencephalon)

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11
Q

epithelium

A

3 cell types; basement membrane attaches it to the stroma; acts as a barrier to the precorneal tear film

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12
Q

stroma

A

90% of the corneal thickness, relatively acellular; contains collagen fibers

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13
Q

endothelium

A

secretes BM
inner part of the cornea, 1 cell layer thick
contains pump to keep cornea dehydrated
edema present if it is damaged

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14
Q

globe

A

round part of the eye

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15
Q

refraction

A

aqueous humor allows for light refraction

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16
Q

retina

A

contains the optic disc, retinal vessels and nontapetum

17
Q

limbus

A

transition between cornea and sclera, area

of weakness

18
Q

Descemet’s membrane

A

basement membrane secreted by the endothelium; about 14 micrometers thick

19
Q

extraocular muscles

A

muscles surrounding the eye, holding it in place as well as allowing movement within the socket

20
Q

ocular media

A

transparent substances of the eye (ex.- cornea, aqueous humor, crystalline lens