1. Rectus muscles that receive two ciliary arteries include:

a. medial, lateral and superior rectus only.

b. medial and lateral rectus muscles only.

c. medial, superior and inferior rectus only.

d. lateral, superior and inferior rectus only.

e. medial, lateral, superior and inferior rectus.

AnswerAnswer: c

All rectus muscles receive two ciliary arteries 

except the lateral rectus.

..

2. Which of the following branch(es) of the ophthalmic division 

     of the trigeminal nerve enter(s) the orbit outside the circle 

      of Zinn:

a. nasociliary nerve.

b. frontal and lacrimal nerves.

c. frontal and nasociliary nerves.

d. lacrimal and nasociliary nerves.

e. frontal, lacrimal and nasociliary nerves..

AnswerAnswer: b

Nasociliary nerve enters the orbit through 

the circle of Zinn.

..

3. The following are true about the vortex veins EXCEPT:

a. they are visible through indirect ophthalmoscopy.

b. there are usually 4 to 7 in each eye.

c. they drain the retina and the choroid.

d. they exist the eye at the equator.

e. they drain into the superior and inferior ophthalmic veins.

AnswerAnswer: c

They drain the choroid, ciliary body and the iris.

.

4. Both the Descemet's membrane and the lens capsule are 

      composed mainly of which type of collagen :

a. Type I

b. Type II

c. Type III

d. Type IV 

e. Type V

AnswerAnswer: d

.

5. The lens:

a. has a thicker anterior lens capsule than the posterior

b. increases in diameter with age.

c. contains lens epithelium under the anterior but not the 

    posterior lens capsule.

d. contains an anterior inverted Y-shaped suture and

   a posterior Y-shaped suture.

e. has a lower refractive power than the cornea.

AnswerAnswer: d

The anterior Y-shaped suture is upright and 

the posterior one inverted.