CO Anatomy & Physiology of the Visual System

Question 1

Which extraocular muscle is responsible for primary abduction of the eye?

Accepted Answer

Lateral rectus

Answer

Medial rectus

Answer

Superior oblique

Answer

Inferior oblique

Question 2

The visual pathway travels from the retina to the primary visual cortex located in which brain lobe?

Accepted Answer

Occipital lobe

Answer

Frontal lobe

Answer

Parietal lobe

Answer

Temporal lobe

Question 3

Which cranial nerve innervates the superior oblique muscle?

Accepted Answer

CN IV (Trochlear)

Answer

CN III (Oculomotor)

Answer

CN V (Trigeminal)

Answer

CN VI (Abducens)

Question 4

At the optic chiasm, which fibers decussate (cross) to the opposite side?

Accepted Answer

Nasal retinal fibers

Answer

Temporal retinal fibers

Answer

All retinal fibers

Answer

No fibers cross at the chiasm

Question 5

The fovea centralis contains predominantly which type of photoreceptors?

Accepted Answer

Cones only

Answer

Rods only

Answer

Equal numbers of rods and cones

Answer

Ganglion cells only

Question 6

The near reflex triad consists of accommodation, miosis, and which third component?

Accepted Answer

Convergence

Answer

Divergence

Answer

Cycloduction

Answer

Abduction

Question 7

Which layer of the retina contains the cell bodies of the photoreceptors?

Accepted Answer

Outer nuclear layer

Answer

Ganglion cell layer

Answer

Inner nuclear layer

Answer

Retinal pigment epithelium