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Flashcards in Eyes Deck (50)
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1

The eye is compose of how many tunics

Fibrous,vascular ,and nervous tunics

2

Fibrous tunic

The outer most layer of the eyes consisting of sclera and cornea

3

Vascular tunic

Underneath the fibrous tunic, rich in supply of blood very vasculrized and some pigment (choroid)

4

Nervous tunic

The inner layer of the eyes underneath the vascular tunic, the retina lies here with it photoreceptors cells rods and cones

5

The cavities of the eye

There are two eye cavities, posterior cavity and anterior cavity

6

The anterior cavity has two chamber.

Anterior chamber and posterior chamber

7

Anterior chamber

Located in front of the iris and its filled with aqueous humor

8

Posterior chamber

This is behind the iris

9

Accommodation

The process of focusing light to the retina

10

Explain the process of accommodation

Suspensory ligament is attached to the ciliary muscle, the ciliary muscle

11

Presbyopia

The thicken of the eye lens, causing the weaken of the suspensory ligament attached to the lens

12

Relaxation of the muscle make the lens ....... and contracting makes the lens .......

Thicker and thinner

13

The ciliary muscle is controlled by the

Cranial nerve 3 ocular motor nerve

14

The three layer of the retina are

Photoreceptors cells(rods and cones), bipolar cells, ganglion cells

15

Describe the direction of the signal sent when light hits the eyes

Light hits the photoreceptor cells and send the signal in one direction to the brain and the signal reacting to the stimulus travels in the opposite direction

16

The image of the outside world is perceived as upside down but the brain

Flips the image receive form the outside world

17

What is the function of the iris

The iris controls the amount of light that goes through by relaxing and contracting

18

Posterior cavity

Filled with vitreous liquid which is very gel like located located behind the lens

19

Suspensory ligament

Attaches lens to ciliary muscle. It has a thing layer around it can make the eye lens thinner or thicker

20

Ciliary muscle

Pulls on the suspension ligament to focus light into the retina by changing the thickness of the lens

21

Crystalline lens

The lens, it is a transparent structure along with the cornea helps with refracting light to be be focused in the retina

22

Cranial nerve 3 ( ocular motor nerve) controls the

Ciliary muscles

23

The retina is part of what tunic

Nervous tunic

24

Photo transduction occurs in what tunic

In the nervous tunic in the retina

25

Horizontal cells and amacrince cells

Are specialized interneurons that ends up in the ganglion cells

26

Photo transduction converting light waves to nerve signals occurs at the

Ganglion cells

27

The transmition of the nerve signal away from the retina is after the ganglion cell by the

Optic nerve ( cranial nerve 2)

28

Rhodopsin

Found in the outer most part of the rods and there are two parts scotopsin and retinal

29

Photoisomerization

When light changes the configuration of cis-retinal to trans-retinal

30

Rhodopsin form is

Csi retinal and scotopsin