Eye

Question 1

Fibrous tunic

Answer 1

• Outer portion of eye

- Sclera & cornea

Question 2

Vascular tunic

Answer 2

• Middle portion of eye
• Choroid
• Ciliary body, lens, iris

Question 3

Nervous tunic

Answer 3

• Inner portion of eye

- Retina, rods and cones

Question 4

Sclera

Answer 4

• Tough, white, outer portion of eye

- Continuous w/ cornea

Question 5

Cornea

Answer 5

• Transparent portion of anterior eye
• Avascular
• Bends and refracts light

Question 6

Choroid

Answer 6

• Middle layer
• Contains blood vessels and darkly pigmented
• Ciliary body, iris, lens

Question 7

Ciliary body

Answer 7

• Holds ciliary muscles (smooth)

- Attached to lens w/ suspensory ligaments to control lens shape

Question 8

Iris

Answer 8

• Colored portion of the eye
• Smooth muscle ring w/ pupil in the middle
• Controls light entering pupil

Question 9

Lens

Answer 9

• Transparent

- Boconvex

Question 10

Retina

Answer 10

• Innermost layer of the eye

- Contains neurons sensitive to light;

Question 11

Rods

Answer 11

• Photorecpetors

- Black and white

Question 12

Cones

Answer 12

• Photoreceptors

- Color

Question 13

Fovea centralis

Answer 13

• Area where light is focused

- Area of sharpest vision

Question 14

Optic disc

Answer 14

-No photoreceptors; aka blind spot

Question 15

Aqueous humor

Answer 15

• Clear, watery fluid

- Helps maintain intraocular pressure

Question 16

Vitreous humor

Answer 16

• Jelly-like substance

- Behind lens & posterior portion of eye;

Question 17

Glaucoma

Answer 17

-Too much intraocular pressure due to too much aqueous humor

Question 18

Extrinsic eye muscles

Answer 18

-Skeletal muscles that move the eye

Question 19

Intrinsic eye muscles

Answer 19

-Smooth muscles in the eye; involuntary

Question 20

Eyebrows

Answer 20

• Accessory structure of eye

- Protects/keeps foreign particles out

Question 21

Eye lashes

Answer 21

• Accessory structure

- Protects/keeps foreign particles out

Question 22

Eye lids

Answer 22

• Accessory structure

- Helps with lubricating eye

Question 23

Conjunctiva

Answer 23

-Mucus membrane lining the lid of eye

Question 24

Conjunctivitis

Answer 24

• Inflammation of conjunctiva
• Caused by an infection or irritation
• Aka pink eye

Question 25

Lacrimal gland

Answer 25

Produces tears to moisten, lubricate, and wash eye

Question 26

Lacrimal canaliculi

Answer 26

Collects excess tears

Question 27

Nasolacrimal duct

Answer 27

Opens to nasal cavity

-Nose runs when you cry

Question 28

Refraction of light rays

Answer 28

1st step of seeing;

• Bending light as it passes from one transparent substance to another
• Light to cornea, aqueous humor, lens, vitreous humor

Question 29

Accommodation of lens

Answer 29

2nd step of seeing;

• Ability of eye to change its focus from distant to near objects, vice versa
• Increase curvature/change lens shape to achieve greater refraction

Question 30

Constriction of pupil

Answer 30

3rd step of seeing;

-Iris contracts to limit amount of light that enters the eye

Question 31

Convergence of eyes

Answer 31

4th step of seeing;

• Light must hit same spot of the retina on both eyes to see only one object
• Both eyes directed on object at same angle

Question 32

Single binocular vision

Answer 32

Seeing ONE object with TWO eyes

Question 33

Steps of seeing

Answer 33

1. Refraction of light rays
2. Accommodation of lens
3. Constriction if pupil
4. Convergence of eyes