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Histology > Exam 3 – Lecture 31: Eye > Flashcards

Exam 3 – Lecture 31: Eye Flashcards

1
Q

What is the eye?

A

An outgrowth of the nervous system in combination with ectoderm

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2
Q

What are functions of the eye?

A 
Sight/vision
Locomotion
Nutrition
Defense
Seasonality/reproduction
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3
Q

What are the tunics of the eye?

A

Fibrous
Vascular
Nervous

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4
Q

What is the fibrous tunic made of?

A

Fibrous dense connective tissue

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5
Q

What is the fibrous layer?

A

Corneoclera

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6
Q

What is the vascular layer?

A

Uvea

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7
Q

What is the nervous layer?

A

Retina

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8
Q

What are the chambers of the eye?

A

Anterior
Posterior
Vitreous

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9
Q

What is the anterior chamber?

A

Cornea to iris

Aqueous humor

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10
Q

What is the posterior chamber?

A

Iris to lens

Aqueous humor

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11
Q

What is the vitreous chamber?

A

Behind lens
Vitreous humor
Keeps the eye distended

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12
Q

Describe the cornea of the fibrous tunic

A 
Corneal epithelium
Bowman's membrane
Stroma
Descemet's membrane
Corneal endothelium
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13
Q

What is corneal edema?

A

When the cornea is thickened and vision is impaired

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14
Q

What makes up most of the globe of the eye?

A

Sclera

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15
Q

What kind of tissue is sclera?

A

Dense fibrous connective tissue

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16
Q

Describe the iris of the vascular tunic

A

Forms the border between anterior and posterior chambers
Pigmented epithelium
Smooth muscle

17
Q

Describe the ciliary body

A

Between the iris and choroid
Zonular fibers attach to the lens
Form blood-aqueous barrier
Secret aqueous humor

18
Q

What does smooth muscle the iris form?

A

Pupil

19
Q

Describe the choroid of the uvea

A

Rear portion

Between retina and sclera

20
Q

What is the lens attached to?

A

The uvea, but does not have blood supply

21
Q

Describe the lens

A 
Transparent
Avascular
Has a capsule 
Subscapular epithelium 
Fibers that are mostly collagen and water
22
Q

What is it called the the lens is not transparent?

A

Cataract

23
Q

How many layers are there in the retina?

A

5 or 7

24
Q

Describe the retina

A

Optic disc

Has a tapetum, which is the reflective portion

Histology (30 decks)

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