Eye

Question 1

Which of the following structures does not travel through the common tendinous ring?

A. abducens nerve

B. nasociliary nerve

C. oculomotor nerve

D. optic nerve

E. trochlear nerve

Answer 1

E. trochlear nerve

Question 2

Contraction of the superior oblique muscle in isolation causes the eye to:

A. depress, abduct, intort

B. depress, abduct, extort

C. depress, adduct, extort

D. elevate, abduct, intort

E. elevate, adduct, extort

F. elevate, adduct, intort

Answer 2

A. depress, abduct, intort

Question 3

A woman suffers a severe head injury. Upon examination you notice that she has ptosis on one side. This could be a result of loss of innervation to the:

A. frontalis

B. levator palpebrae superioris

C. orbicularis oculi

D. superior oblique

E. superior rectus

Answer 3

B. levator palpebrae superioris

Question 4

Which of the following structures is correctly associated with its source of derivation?

A. cornea - outer layer of optic cup

B. lens - neural crest cells

C. neural retina - inner layer of optic cup

D. ophthalmic artery - hyaloid artery

E. pigmented retina - mesoderm

Answer 4

C. neural retina - inner layer of optic cup

Question 5

Parasympathetics traveling in the oculomotor nerve innervate the:

A. ciliary muscle

B. cornea

C. dilator pupillae

D. lacrimal gland

E. superior tarsal muscle

Answer 5

A. ciliary muscle

Question 6

Which of the following does NOT travel through the superior orbital fissure?

A. CN II

B. CN III

C. CN IV

D. CN V1 (ophthalmic n.)

E. CN VI

Answer 6

A. CN II

Question 7

Which of the following is a correct path for tears from the lacrimal gland to the nasal cavity?

A. lacrimal gland -> lacrimal canaliculi -> lacrimal puncta -> lacrimal sac -> nasolacrimal duct

B. lacrimal gland -> lacrimal puncta -> lacrimal canaliculi -> lacrimal sac -> nasolacrimal duct

C. lacrimal gland -> lacrimal puncta -> nasolacrimal duct -> lacrimal sac -> lacrimal canaliculi

D. lacrimal gland -> lacrimal sac -> lacrimal canaliculi -> lacrimal puncta -> nasolacrimal duct

E. lacrimal gland -> lacrimal sac -> lacrimal canaliculi -> nasolacrimal duct -> lacrimal puncta

Answer 7

B. lacrimal gland -> lacrimal puncta -> lacrimal canaliculi -> lacrimal sac -> nasolacrimal duct

Question 8

During normal eye movements, which pair of muscles causes the eye to elevate?

A. inferior rectus and inferior oblique

B. inferior rectus and superior oblique

C. superior rectus and inferior oblique

D. superior rectus and superior oblique

E. superior oblique and inferior oblique

Answer 8

C. superior rectus and inferior oblique

Question 9

The function of the ciliary muscle is to:

A. constrict the pupil

B. dilate the pupil

C. make the lens flatter for close focusing

D. make the lens rounder for close focusing

E. put tension on the suspensory (zonule) fibers

Answer 9

D. make the lens rounder for close focusing