The Special Senses (Vision) Flashcards Preview

Anatomy Final > The Special Senses (Vision) > Flashcards

Flashcards in The Special Senses (Vision) Deck (35):
1

What are the accessory structures of the eye

Eyebrows
Eyelids
Conjunctiva
Lacrimal Apparatus
Extrinsic eye muscles

2

What shades the eye from sunlight and keeps out the sweat from the forhead

Eyebrows

3

What protects the eyes from both foreign objects and from drying out

Eyelids

4

How does the eyelids protect the eyes

reflex blinking

5

Mucous membrane that lines the eyelid and edges of the eye, produces lubricating mucous to prevent eye from drying out

Conjunctiva

6

Produces tears which clean and disinfect the eyes, has an opening that drains into the nose

Lacrimal apparatus

7

What does the lacrimal produce that clean and disinfect the eyes

Tears that contain antibodies and enzymes

8

Muscles that move the eyeball

Extrinsic Eye Muscles

9

What are the extrinsic eye muscles

4 rectus muscles and 2 oblique muscles

10

What is the structure of the eye, in other words what is he wall of the eye made of

3 tunics (layers)

11

What are the 3 tunics of the eye

Fibrous
Vascular
Sensory

12

The outer covering of the eye, the main part of the fibrous tunic, what does it do

Sclera; provides protection

13

What is also part of the fibrous tunic

Cornea

14

Anterior, transparent fibrous portion of the fibrous tunic that allows light to enter the eye and refracts light

Cornea

15

The highly vascular, dark brown membrane that makes up most of the vascular unic

Choroid Coat

16

What does the choroid coat do

~Provides nourishment (by capillaries) to most of the eye
~prevents the scattering and reflecting of light

17

What other parts of the eye are part of the vascular tunic

ciliary body and iris

18

What layer of the eye is part of the sensory tunic and what does it do

Retina; contains visual receptor cells (bipolar neurons)

19

What is also part of the sensory tunic

the Optic Disk

20

the spot where the retina attaches to the optic nerve; causes a blind spot

Optic Disk

21

Transparent, elastic structure whose shape is controlled by the actions of the ciliary muscles

The lens

22

What is special about the lens

it changes shape to permit focusing on objects various distances from the eye

23

Lens become opaque

Cataract

24

Muscular diaphragm that controls the amount of light entering the eye

the iris

25

Opening in the iris

Pupil

26

What fluids help maintain the shape of the eye

the Vitreous and Aqueous humor

27

Jellylike fluid that fills the posterior chamber and separates the lens and the retina

Vitreous Humor

28

Watery fluid that fills the anterior chamber and separates the cornea and the lens

Aqueous Humor

29

The bending of light to focus it on the retina

The refraction of light

30

Light rays are primarily refracted by:

Cornea and Lens

31

What does most of the refracting but remains fixed

Cornea

32

Its highly elastic curvature can be changed to allow fine focusing

Lens

33

When the lens is thickened to focus on close objects

Accomodation

34

one can see things that are close but not far away

Nearsightedness

35

One can see things that are distant but not close up

Farsightedness