Question 1 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?
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Vitreous / Retina / Choroid
Anatomy
No
U
C
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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