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ANATOMY II > The Eye > Flashcards

Flashcards in The Eye Deck (68)
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1

The orbit is formed by which bones?

Frontal, maxillary, zygomatic bones and lacrimal

2

The orbit's boundaries - roof

frontal anf sphenoid

3

The orbit's boundaries - medial border

maxilla, lacrimal and ethmoid

4

The orbit's boundaries - lateral border

zygomatic and sphenoid

5

The orbit's boundaries - floor

maxilla and palatine

6

Why is the orbit concave?

to increase field of vision

7

Lateral margin of the orbit is at the junction of the...

frontal and zygomatic bones

8

The infraorbital margin extends upward to form what?

the anterior lacrimal crest

9

The supraorbital margin extends downward to form what?

the posterior lacrimal crest.

10

What is the purpose of the lacrimal apparatus?

to produce and drain lacrimal fluid (tears)

11

What do tears contain?

salt, mucous and lyzosymes

12

What is the function of the lacrimal gland?

Lubricates, moistens and cleans the conjunctiva

13

What does the lacrimal gland contain?

water, salt, mucin, and a bacterocidal enzyme

14

Explain what happens to the tears in the general process of removing them

half of them from the lacrimal gland evaporate. The remainder enter the papilla for drainage into the lacrimal sac. The lacrimal sac is connected to the nasolacrmal duct. Then it enters the nasal cavity and is covered by a mucous membrane.

15

What are the functions of the eyelashes/eyebrows?

Protects eyevall from foreign things, protects from perspiration, shades the eye from direct sun rays.

16

Which glands are at the base of the eyelids? What do they do?

Sebaceous (ciliary) glands are at the base, used to release a lubricating fluid into the hair follicles to avoid infection (like sty)

17

What do the sebaceous glands located between the eyelid and conjunctiva serve to do?

prevent sticking of eye

18

Which other glands are there of the eye?

suderiferous (sweat) glands

19

What does the lacrimal caruncle secrete?

sebacious and suderiferous glands

20

Which cranial nerve is associated with orbicularis occuli?

CVII

21

What does the levator palpebrae superioris (CIII) do?

raises upper lid

22

What are the 3 layers of the eyeball?

Fibrous, vascular and nervous tunic

23

What is the purpose of the sclera?

gives shape to and protects inner structure of eyeball.

24

What is the purpose of the cornea?

helps focus light through to the retina

25

Cornea has a (greater/lesser) convex curvature than the sclera.

Greater

26

Why is the choroid darkly pigmented?

For light absorption

27

What does the choroid do?

Provides nutrients to the retina

28

The ciliary body is layers of __________ muscle.

smooth

29

What does the ciliary body do?

Alters the shape of the lens (refraction or accommodation)

30

What does the iris do?

Responds to change in the light levels and controls the amount of light entering. dilating or constricting of the pupil.