Anatomy of the eye and orbit (eyeball)

Question 1

Name the 2 parts which make up the fibrous coat

Answer 1

sclera and cornea

Question 2

Describe the sclera

Answer 2

posterior 5/6, white and gives attachment to muscles moving the eyeball

Question 3

Describe the cornea

Answer 3

anterior 1/6, transparent, allows light to enter the eyeball

Question 4

Vascular coat components

Answer 4

choroid, iris, ciliary body

Question 5

What produces aqueous humor?

Answer 5

ciliary body

Question 6

Functions of ciliary body

Answer 6

aqueous humor production and to suspend the lens

Question 7

iris function

Answer 7

controls the diameter of the pupil to control the amount of light rays entering

Question 8

choroid

Answer 8

blood supply to outer layers of retina

Question 9

How many layers does the retina have?

Answer 9

10

Question 10

Sensory coat

Answer 10

retina - light sensitive rods and cones

Question 11

Why is the vascular layer incomplete?

Answer 11

due to the pupil

Question 12

What part of the eyeball separates the anterior and posterior segments?

Answer 12

lens

Question 13

What fluid is found in the anterior and posterior segments?

Answer 13

anterior = aqueous humor 
posterior = vitreous humor

Question 14

What nerve is found at the back of they eye, what cranial nerve is this and through which cranial foramen does it pass?

Answer 14

optic nerve - CN 2

optic canal

Question 15

What type of lens is the one found in the eye? (3)

Answer 15

crystalline
biconvex
transparent

Question 16

How is the lens suspended?

Answer 16

by suspensory ligaments from the ciliary body

Question 17

How many degrees are the suspensory ligament and ciliary body found?

Answer 17

360

Question 18

What are the anterior and posterior chambers of the eye?

Answer 18

both part of the ANTEORIOR SEGMENT and hence contain aqueous humor
separated by the iris

Question 19

Aqueous humor function

Answer 19

maintain intraocular pressure

Question 20

vitreous humor function

Answer 20

cushion the retina

Question 21

Explain the formation and drainage of aqueous humor

Answer 21

produced by the ciliary body into the posterior chamber
passes to the angle of the anterior chamber and into the anterior chamber
exits the eye through the trabecular meshwork and into Schlemm’s canal

Question 22

How is the cornea seen from the surface of the eye?

Answer 22

reflection of light