CO Anatomy & Physiology of the Visual System 3

Question 1

The Edinger-Westphal nucleus provides parasympathetic innervation to which intraocular structures?

Accepted Answer

Sphincter pupillae and ciliary muscle

Answer

Dilator pupillae and superior rectus

Answer

Lateral rectus and sphincter pupillae

Answer

Ciliary muscle and superior oblique

Question 2

Which of the following correctly describes the action of the inferior oblique muscle in primary position?

Accepted Answer

Extorsion, elevation, and abduction

Answer

Intorsion, depression, and adduction

Answer

Intorsion, elevation, and abduction

Answer

Extorsion, depression, and adduction

Question 3

Panum's fusional area refers to which concept in binocular vision?

Accepted Answer

The region around the horopter within which objects are seen in single binocular vision

Answer

The area of maximum visual acuity on each retina

Answer

The overlap zone of the two monocular visual fields

Answer

The range of vergence amplitudes

Question 4

The optic nerve exits the eye through which structure and is surrounded by an extension of the meninges?

Accepted Answer

The lamina cribrosa of the sclera

Answer

The ora serrata

Answer

The trabecular meshwork

Answer

The ciliary body

Question 5

Accommodation is primarily achieved by which change in the crystalline lens?

Accepted Answer

The lens becomes more convex due to ciliary muscle contraction and zonule relaxation

Answer

The lens flattens due to ciliary muscle contraction

Answer

The lens moves anteriorly due to vitreous pressure

Answer

The lens increases in diameter due to ciliary muscle relaxation

Question 6

Which pathway mediates the consensual pupillary light reflex (contralateral pupil constriction)?

Accepted Answer

Commissural fibers connecting the two Edinger-Westphal nuclei via the posterior commissure

Answer

Fibers crossing in the posterior commissure from the ipsilateral pretectal nucleus

Answer

Fibers decussating at the chiasm and traveling to the Edinger-Westphal nucleus directly

Answer

Fibers from the ipsilateral LGN projecting bilaterally

Question 7

In the stereoscopic depth perception mechanism, crossed disparity signals indicate that an object is located where relative to the fixation point?

Accepted Answer

In front of the fixation plane (closer to the observer)

Answer

Behind the fixation plane (farther away)

Answer

At the same distance as the fixation point

Answer

In the peripheral visual field