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PNS > Eye > Flashcards

Eye Flashcards

1
Q

The eye is derived from what?

A

Ectoderm

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2
Q

What structures of the eye are derived from neruoectoderm of the forebrain?

A

Retina and pigmented structures

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3
Q

What parts of the eye are derived from surface ectoderm?

A

Lens and cornea

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4
Q

Fibrous coats (sclera) is derived from what?

A

Neural crest mesenchyme

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5
Q

The sclera is part of what tunic?

A

Fibrous (outermost Tunic) q

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6
Q

What are characteristics of the sclera?

A

Thick, dense, FIRM, opaque

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7
Q

The sclera maintains it shape when what happens?

A

Pressure inside the eye increases

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8
Q

What structures pass through the sclera?

A

Blood vessels, neurons

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9
Q

What kind of muscles attach to the sclera?

A

Extraocular

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10
Q

Anteriorly, the sclera transitions to the cornea where?

A

The Limbus

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11
Q

What is the primary refractory part of the eye?

A

Cornea

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12
Q

What does the cornea look like>?

A

Clear, transparent

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13
Q

Is the cornea convex or concave to the anterior?

A

Convex

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14
Q

What part of the cornea is continuous with the conjunctiva?

A

Corneal epithelium

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15
Q

What is the largest part of the cornea?

A

Substantia propria

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16
Q

What is in the vascular Tunic?

A

Choroid, ciliary body, iris

17
Q

Is the choroid thick or thin, good or bad blood supply?

A

Thin, RICH blood supply

18
Q

Blood vessels in the choroid are heavily supplied by what?

A

Autonomic vasomotor fibers (especially sympathetic)

19
Q

How is the choroid attached to the sclera?

A

Loosely

20
Q

Where is the only spot where the choroid is firmly attached to the sclera?

A

Where the optic nerve penetrates it

21
Q

Is the choroid lightly or darkly pigmented?

A

Darkly

22
Q

The ciliary body is continuous with what to the posterior?

A

Choroid

23
Q

The ciliary body is continuous with what to the anterior?

A

Iris

24
Q

What suspends the lens?

A

The ciliary body

25
Q

What does the ciliary body produce and where is it found?

A

Aqueous fluid, anterior segment of the eye

26
Q

Contraction of the ciliary muscle allows the lens to become more_________allowing for _________vision?

A

Convex, near

27
Q

Besides producing aqueous fluid, it is possible that the ciliary body can produce what?

A

GAGS

28
Q

What is the colored part of the eye ?

A

Iris

29
Q

What divides the anterior segment into anterior and posterior chambers?

A

Iris

30
Q

What two muscles control the size of the pupil ?

A

Sphincter pupillae, dilator pupillae

31
Q

Sphincter pupillae contains fibers that are arranged in what fashion?

A

Circumferentially

32
Q

Dilator pupillae is innervated by what fibers?

A

Sympathetic fibers

PNS (1 decks)

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