Question 12 of 14

(demo test)

Product Demo for Part I Questions

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A representative electroretinogram (ERG) in a normal individual is shown in the figure above. Which retinal structure does the waveform labeled "3" in the figure correspond to?

A. bipolar and Muller cells

B. photoreceptors

C. retinal pigment epithelium

D. nerve fiber layer

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Category:

Vitreous / Retina / Choroid

Topic:

Anatomy

High Yield:

No

Your Answer:

U

Correct Answer:

C

Explanation:

The 3rd waveform ("3") is called the "c-wave" and represents the electrical response from the RPE.  The second waveform ("2"), which has a positive (upgoing) deflection, is called the "b-wave." It corresponds to the responses of the middle retinal layers containing the bipolar and Muller cells.

The negative waveform ("1") is called the "a-wave" and represents the response of the photoreceptors.

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