Question

Which electrode can be used to pick up signals from individual fibers of muscle tissues?

(a) biopolar needle electrode

(b) concentric core needle electrode

(c) multi-element needle electrode

(d) monopolar needle electrode

I got this question during a job interview.

This interesting question is from Electrodes for EMG in chapter Bioelectric Signal and Electrodes of Biomedical Instrumentation

Answer 1

Correct option is (c) multi-element needle electrode

Easiest explanation: Multi-element needle electrodes are used to pick up the signals from individual fibers of muscle tissue. Special needles are available using 25-micron diameter electrode surfaces. They have up to 14 pickup surfaces down the side of one needle.