COA Ocular Anatomy and Physiology

Question 1

The avascular cornea receives oxygen primarily from which sources?

Accepted Answer

Tear film and aqueous humor

Answer

The ophthalmic artery

Answer

Vitreous humor

Answer

Conjunctival vessels

Question 2

Which layer of the cornea has the greatest capacity for regeneration after injury?

Accepted Answer

Epithelium

Answer

Bowman's layer

Answer

Stroma

Answer

Descemet's membrane

Question 3

Aqueous humor is produced by which ocular structure?

Accepted Answer

Ciliary body

Answer

Trabecular meshwork

Answer

Iris

Answer

Choroid

Question 4

The macula lutea is characterized by which feature?

Accepted Answer

High concentration of cones and the fovea centralis

Answer

Absence of all photoreceptors

Answer

High concentration of rod cells

Answer

Location in the nasal retina

Question 5

The physiologic blind spot corresponds to which ocular structure?

Accepted Answer

The optic disc where no photoreceptors exist

Answer

The fovea centralis

Answer

The macula lutea

Answer

The ora serrata

Question 6

Which cranial nerve controls the majority of extraocular muscles?

Accepted Answer

CN III (oculomotor)

Answer

CN IV (trochlear)

Answer

CN VI (abducens)

Answer

CN V (trigeminal)