CO Anatomy & Physiology of the Visual System 2

Question 1

Which structure in the visual pathway serves as the primary relay station between the retina and the visual cortex?

Accepted Answer

Lateral geniculate nucleus (LGN)

Answer

The lateral geniculate nucleus (LGN) of the thalamus is the main relay station for visual information traveling from the retina to the primary visual cortex.

Question 2

The pupillary light reflex afferent pathway travels via which structure before reaching the pretectal nucleus?

Accepted Answer

Optic nerve and optic tract

Answer

The afferent limb of the pupillary light reflex travels along the optic nerve and optic tract to the pretectal nucleus in the midbrain, bypassing the LGN.

Question 3

The superior oblique muscle intorts and depresses the eye in which position of gaze?

Accepted Answer

Adduction

Answer

The superior oblique is the primary depressor and intorter when the eye is in adduction, which is why CN IV palsy causes vertical diplopia worse in adduction.

Question 4

The vestibulo-ocular reflex (VOR) functions primarily to maintain what?

Accepted Answer

Stable retinal images during head movement

Answer

The vestibulo-ocular reflex stabilizes retinal images during head movement by generating compensatory eye movements equal and opposite to head rotation.

Question 5

Optic radiations carrying superior visual field information travel through which anatomical region?

Accepted Answer

Meyer's loop in the temporal lobe

Answer

Superior visual field fibers travel through Meyer's loop, an anterior loop of the optic radiation in the temporal lobe, explaining why temporal lobe lesions cause superior quadrantanopia.

(CO) Certified Orthoptist Practice Test

(CO) Certified Orthoptist Practice Test

CO Anatomy & Physiology of the Visual System 2