ABO Ocular Anatomy & Physiology 3

Question 1

Which portion of the aqueous humor drainage system is located in the angle of the anterior chamber?

Accepted Answer

Trabecular meshwork

Answer

The trabecular meshwork lines the angle of the anterior chamber and is the primary site of aqueous humor outflow resistance.

Question 2

The choroid's primary physiological role is to:

Accepted Answer

Supply oxygen and nutrients to the outer retina

Answer

The choroid is a highly vascular layer that provides oxygen and nutrients to the outer retinal layers, including the photoreceptors.

Question 3

Which cranial nerve controls the superior oblique muscle responsible for intorsion and depression of the adducted eye?

Accepted Answer

CN IV

Answer

The trochlear nerve (CN IV) innervates the superior oblique muscle, which intorts and depresses the eye especially when adducted.

Question 4

The limbus is clinically important because it contains:

Accepted Answer

Corneal stem cells, aqueous drainage structures, and is a surgical landmark

Answer

The limbus contains corneal epithelial stem cells (at the palisades of Vogt), drainage structures, and is used as a landmark for surgical incisions.

Question 5

What type of collagen predominates in the corneal stroma and contributes to its transparency?

Accepted Answer

Type I collagen in regular orthogonal lamellae

Answer

The corneal stroma contains type I collagen arranged in precise orthogonal lamellae of uniform diameter, which minimizes light scattering and ensures transparency.

ABO - American Board of Optometry Practice Test

ABO - American Board of Optometry Practice Test

ABO Ocular Anatomy & Physiology 3