Question

In order to take EMG, there exists a special electrode of 25μ diameter and 14 needles like pick up surfaces. What is this electrode used for?

(a) Deeper penetration of muscle to take ECG

(b) The larger surface area is covered

(c) Multiple signals from the same muscle

(d) Individual signals from individual muscle fibers

The question was posed to me during a job interview.

I need to ask this question from Electromyography in chapter Diagnostic Investigation in Neurology and Cardiology of Clinical Science

Answer 1

The correct choice is (d) Individual signals from individual muscle fibers

The explanation is: The needles of the electrode increase the surface area and allow for all the needles to pick up signals from every fiber of the muscle individually. This way, the signals from every muscle fiber can be analysed and it is easier to point out the damaged area more accurately.