Exam 4 Special Sense Organs Flashcards Preview

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Flashcards in Exam 4 Special Sense Organs Deck (84)
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1

What is the eye derived from

Ectoderm

2

Neuroectoderm of the forebrain forms what?

Retina and pigmented structures

3

Surface ectoderm of the eye forms what

Lens and cornea

4

What forms from neural crest mesenchyme

Fibrous coats (sclera)

5

What are the 3 coats/tunics of the eye

Fibrous (outermost), vascular, and nervous tunic(retina)

6

If pressure inside the eye increases what happens to the sclera

It will not bulge, it maintains shape

7

What structures pass through the tiny openings in the sclera

Neurons and blood vessels

8

What attach directly to the sclera

Extraocular muscles

9

What is significant about the anterior portion of the sclera

It transitions to the cornea at the limbus and is lined with conjuctiva

10

What is the transition between the sclera and the cornea

At the limbus

11

What is significant about the posterior portion of the sclera

It is continuous with the fibrous sheath that covers CN II, contains subarachnoid space filled with CSF

12

What part of the fibrous tunic is the cornea

The anterior portion

13

What is the important function of they cornea

It is the primary refractory part of the eyeball

14

Which part of the cornea is convex

To the anterior

15

What are the 5 layers of the cornea from anterior to posterior

Corneal epithelium, anterior limiting lamina, substantia propria, posterior limiting lamina, endothelium

16

What is the corneal epithelium continuous with

The conjunctiva

17

What is the largest part (layer) of the cornea

Substantia propria

18

The endothelium of the cornea is the most internal layer and has what purpose

Covers inside surface of the cornea and lines the iridocorneal layer

19

What 3 structures are a part of the vascular tunic

Choroid, ciliary body, and iris

20

The blood vessels of the choroid are heavily supplied by what

Autonomic, vasomotor fibers that may have a cooling effect

21

How is the choroid attached to the sclera

Loosely except where the optic nerve penetrates, here it is firmly attached to the sclera

22

What is the pigment of the choroid

Darkly pigmented to limit passage of light from sclera to retina and vice versa

23

Where is the ciliary body located in relation to the choroid and iris

Continuous with the choroid to the posterior and the iris to the anterior

24

What is the purpose of the ciliary body

It suspends the lens and produces the aqueous fluid found in the anterior segment of the eye, some GAGS of the vitrous body

25

What does the ciliary body contain

The ciliary muscle - contraction of the muscle allows the lens to become more convex allowing near vision

26

What does the iris divide

The anterior segment into anterior and posterior chambers

27

What is the iris composed of muscle-wise

Consists of two muscles that control the size of the pupil

28

Sphincter pupillae contains what

Fibers arranged circumferentially that constrict the pupil

29

What is the spincter pupillae innervated by

Parasympathetic fibers (CN 3)

30

What does the dilator pupillae will cause what

Causes the pupil to become larger when it contracts