PRACTICE QUESTIONS

1. A patient whose left pupil diameter is smaller than nor­mal, whose left upper eyelid droops, and whose left “third eyelid” is abnormally displaced likely has a lesion of which of the following structures?

a.

b. Left vagosympathetic nerve trunk

c. Right oculomotor nerve

d. Right vagosympathetic nerve trunk

e. Left optic tract

2. Which of the following is not characteristic of the cone system?

a. Many photoreceptors converging on single bipolar cell

b. Good visual acuity

c. Multiple photopigments

d. Day vision

e. Color vision

f. All the above are characteristic of the cone system

3. Your friend, a member of the soccer team, is trying without much success to explain the cause for the teams recent losing trend. A variety of implausible explanations are proposed until she mentions that she is progressively losing vision, but only in her left visual field, and has frequent headaches. You recommend that she see a neurologist because she likely has a lesion in her:

a. Left optic tract

b. Right optic nerve

c. Right optic tract

d. Optic chiasm

e. Left optic radiations

4. Which of the following regarding the lens is false?

a. Itliesbehindtheiris.

b. It plays an important role in focusing a visual image on the retina.

c. It contains a jellylike substance.

d. Its shape does not normally change.

e. An increase in its opacity is called a cataract.

5. You examine a patient’s pupillary light reflexes. Shining a light into the left eye produces both a positive direct and a positive consensual pupillary response. However, shin­ing the light into the right eye produces neither a direct nor an indirect pupillary response. This patients patho­logical lesion is located in which of the following structures?

a. Left optic nerve

b. Left oculomotor nerve

c. Right optic nerve

d. Right oculomotor nerve

e. Left primary visual cortex