HIST: Of Eye and Ear

Question 1

What does the inner layer of the optic cup form?

Answer 1

Neural retina

Question 2

What does the outer layer of the otpic cup form?

Answer 2

Retinal pigmented epithelium

Question 3

What is the purpose of the neural retina?

Answer 3

Contains photoreceptors

Question 4

What is the purpose of the retinal pigmented epithelium?

Answer 4

Absorbs light, prevent reflections, major component of blood-retinal barrier, phagocytoses

Question 5

What does the ciliary muscle do?

Answer 5

Accomodation

Question 6

What is the function of the cornea?

Answer 6

Chief refractive element of the eye

Non keratinized stratified squamous

Question 7

Where are the choroid, iris + ciliary body located in?

Answer 7

Vascular coat

Question 8

What is the iris?

Answer 8

Forms contractile diaphragm in forn of lens, contains dilator + sphincter pupillae

Question 9

What fibers suspend the lens?

Answer 9

Zoncular fibers

Question 10

What is cataracts?

Answer 10

Loss of transparency of lens

Question 11

What is presbyopia?

Answer 11

Loss of lens elasticity w/ age (problems w/ near and distant vision)

Question 12

What is the purpose of the retinal layer?

Answer 12

Blood-neural layer

phocytoses

Isomerises all-trans to all-cis

Question 13

What is the fovea centralis?

Answer 13

The highest concentration of cones

Question 14

What is retinablastoma?

Answer 14

AD
loss of Rb (tumor suppressor gene)

malignant tumor of retina

“white pupil”

Question 15

Question 16

What is in semicircular canals have that serve as sensors of rotational velocity?

Answer 16

Cupula

Question 17

The utricle + sacle have a _____ that has crystals they use ase sensors for gravity + linear rotation.

Answer 17

Macula