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Histology > [2] Lecture 20-the Eye > Flashcards

[2] Lecture 20-the Eye Flashcards

1
Q

Cornea and sclera make up the:

A

Fibrous tunic

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2
Q

Choroid, ciliary body, and iris make up the

A

vascular tunic

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3
Q

Retina =

A

Inner tunic.

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4
Q

Outermost layer of eye.
Loosely arranged collagen and elastic fibers.
Highly vascular.
Attached the lining of the eyelid (conjunctiva) to the sclera

A

Episcleral layer

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5
Q

Made up interlacing collagen fiber.
Attachemnet site for tendons of extrinsic eye muscles.
Collagen bundles are always parallel to outer surface of sclera.

A

Sclera proper

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6
Q

Perforated disc of sclera.

Pass through for optic nerve fibers
**

A

Lamina cribrosa

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7
Q

Anteriorly the sclera is continuous w/ ______

A

Cornea

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8
Q

The junction between cornea and sclera is the :

A

Limbus

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9
Q

Is the limbus vascularized

A

Highly vascularized

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10
Q

Retina is really part of the:

A

Brain

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11
Q

Posteriorly the sclera is continuous w/ the dural covering of the _______________

A

Optic nerve

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12
Q

Layers of the cornea [5]

A

Corneal epithelium

Bowmans membrane

Corneal stroma

Descemet’s membrane

Corneal endothelium

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13
Q

Stratified nonkeratinized squamous epithelium. 5-6 layers

High mitiotic activity in basal layer.
Turnover-1 week

A

Corneal epithelium

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14
Q

Acellular layer separates epithelium from stroma.

Randomly arranged collagen fibers - even though acellular.

A

Bowmans membrane.

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15
Q

Thin layers of ordered arrays of collagen fibers in cornea

A

Corneal stroma

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16
Q

A cellular layer of collagen bundles

Separates stroma from endothelium

A

Descemets membrane

17
Q

Single layer of large squamous cells in cornea

A

Corneal endothelium

18
Q

Extends anterior to ora serrata of the retina.

Highly vascularized layer of loose CT-Forms choriocapilary network. Provides nutrient or outer layers of retina. Also melanocytes.

Bruch’s [glassy] membrane-acellular fused basal laminae

A

Choroid

19
Q

Wedge-shaped expansion of choroid peripheral to the lens.
Covered by a double layer of cells:
Innermost is continuous w/ pigmented retinal layer.
Surface layer is sensory of retina.
Produces aqueous humor.

Suspensory ligaments extend to just behind lens equator and anchor the lens in place.
Ciliary muscles- accommodation. Innervated by parasympathetic.

A

Ciliary body

20
Q

Aqueous humor initially flows into:

A

Posterior chamber

21
Q

Ciliary muscles and accommodation

Nonpigmented surface layer of cells producing aqueous humor- basal infoldings,secrete aqueous humor into posterior chamber

A

Ciliary body.

22
Q

Located anterior to the lens and separates the anterior and posterior chambers.

Angle- formed at lateral borders, loose CT, passageway for aqueous humor.

Creates opening= pupil.

Double layer of epithelium

Melanocytes present.

A

Iris

23
Q

2 subdivisions divided by the ora serrata.

Optic disc.

Fovea centralis.

Contains rods/cone.

A

Retina.

24
Q

Region on posterior eye where optic nerve exits.

Blind spot.

Has no photosensitive retina

A

Optic disc.

25
Q

2.5mm lateral to optic disc.

Contains yellow pigment= macula lutea

Contains only cones

Area of most acute vision.

A

Fovea centralis

26
Q

Nonphotosensitive layers in eye:

A

Iris covering, ciliary body. And ciliary processes

27
Q

Where is the photosensitive region [in retina]?

A

Posterior to the ora serrata

28
Q

3 chambers of eye

A

Anterior

Posterior

Vitreal chamber

29
Q

Posterior to cornea and anterior to iris

A

Anterior chamber

30
Q

Posterior to iris and anterior to lens

A

Posterior chamber

31
Q

Posterior to lens

Contains vitreous body.

Gelatinous mass made up of 99% water, hyaluronic acid, and vitrein

Hyaloid canal is the site of fetal artery.

A

Vitreal chamber

32
Q

Increased intraocular pressure d/t compromised drainage of aq. Humor from anterior chamber

A

Glaucoma

Histology (13 decks)

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