Lens

Question 1

Where are the newest fibers of the lens found

Answer 1

Cortex

Question 2

Why is the cortex in your lens when 5 different from the 65

Answer 2

Cortecofibers surround it, these fibers then go to the adult nucleus

Question 3

What sutures are found in the adult nucleus and cortex

Answer 3

stellate

Question 4

Where is the lowest protein content of the lens fibers found?

Answer 4

cortex

Question 5

Where are the newest fibers of the lens?

Answer 5

cortex

Question 6

What are the junctions of the fibers?

Answer 6

ball and socket, inter-digitation, gap

Question 7

What is the purpose of a ball and socket joint?

Answer 7

to allow for movement

Question 8

what is the purpose of interdigitation?

Answer 8

to provide structure and support

Question 9

Where are the bulk of the lens fibers?

Answer 9

cortex and adult fibers

Question 10

what is the orientation of the lens fibers

Answer 10

hexagonal

Question 11

what determines the amount of fibers in different animals

Answer 11

how much the lens is used

Question 12

What is the shape of the fiber cell?

Answer 12

opposite end curvature (S)

Question 13

what are the constrains on lens fibers?

Answer 13

Size (10mm long), polarity (apical and basal), shape (opposite end curvature)

Question 14

Where is the highest protein content and highest refractive content in the lens

Answer 14

embryonic nucleus

Question 15

Where do the lens fibre ends meet?

Answer 15

Y sutures

Question 16

how long can lens fibers get?

Answer 16

10mm

Question 17

what type of suture is anterior?

Answer 17

apical

Question 18

What type of suture is posterior?

Answer 18

basal

Question 19

What is the stellate shape?

Answer 19

star shape

Question 20

Does the Y suture always remain

Answer 20

yes

Question 21

Why must we branch from the Y suture?

Answer 21

because of length constraints

Question 22

what type of y does the anterior surface exhibit

Answer 22

upright y

Question 23

what type of y suture does the posterior surface exhibit?

Answer 23

upside down y

Question 24

Where does the stellate branch from

Answer 24

Y suture

Question 25

why do lens fibers compress?

Answer 25

because there is a limited amount of space in the eye

Question 26

when do lens fibers compress?

Answer 26

as we age

Question 27

What is the etiology of age related cataracts?

Answer 27

compression of the lens fibers

Question 28

What happens as we age and the lens fibers compress

Answer 28

it makes it harder to get nutrients into the lens and to get waste out. this leads to cataracts

Question 29

What does cataracts cause?

Answer 29

increased light scattering and less transparancy

Question 30

What is brunessence?

Answer 30

yellowing of the lens

Question 31

How do you fix cataracts?

Answer 31

surgery

Question 32

what is presbyopia

Answer 32

hardening of the eye

Question 33

what can lead to cataract formation

Answer 33

taking steroids, smoking, vitrial problem, not exercising, genes, etc

Question 34

Where is cataracts found in the lens

Answer 34

at any place in the lens