ABO Ocular Anatomy & Physiology 4

Question 1

The lens derives its nutrition primarily from:

Accepted Answer

The aqueous humor bathing its surfaces

Answer

The adult lens is avascular and depends entirely on the aqueous humor for nutrients such as glucose and oxygen, and for waste removal.

Question 2

Which layer of the retina contains the cell bodies of bipolar cells?

Accepted Answer

Inner nuclear layer

Answer

The inner nuclear layer contains the cell bodies of bipolar, horizontal, amacrine, and Müller cells.

Question 3

The cornea receives its sensory innervation from which nerve?

Accepted Answer

Nasociliary branch of CN V1

Answer

The cornea is innervated by the nasociliary branch of the ophthalmic division (V1) of the trigeminal nerve via the long ciliary nerves.

Question 4

In the visual pathway, fibers from the inferior nasal retina (representing the superior temporal visual field) decussate at the chiasm and travel in which portion of the optic tract?

Accepted Answer

Ventral optic tract

Answer

Inferior nasal retinal fibers decussate at the chiasm and travel in the ventral portion of the contralateral optic tract.

Question 5

Which structure connects the ciliary body to the lens and is responsible for maintaining lens shape during accommodation?

Accepted Answer

Zonules of Zinn (zonular fibers)

Answer

The zonules of Zinn (zonular fibers) connect the ciliary body to the lens capsule and transmit ciliary muscle forces to change lens shape during accommodation.

ABO - American Board of Optometry Practice Test

ABO - American Board of Optometry Practice Test

ABO Ocular Anatomy & Physiology 4