The electromyography is to collect the electrical potentials of the muscles with the appropriate electrodes, transmit it to an amplifier, and pass the cathode ray tube to the audio system if it is audible with the ear so that these signals can be magnified and examined several millions of times in the amplifier. Dubois Reymond (1851) became the first person to record muscle potentials in the human body.
In 1912, a cathode-ray tube was discovered and the electronomy-biography actually began. In 1929, Adrian and Bronk developed the possibility to observe the bioelectrical activity of a few muscle fibers, rather than the electrical activity of large muscle masses, as has always been the case before, by coacting with coaxial needles. The developments have continued and techniques that can still record the signals observed in the cathode tube through special cameras are used when required.
Electrodes are two kinds. Needle electrodes and surface electrodes. Inside the needle electrodes are a thin wire insulated with the environment. Only the tip is open. The active electrode is only the exposed end and the area is not exceeding 1 mm2. Some may have two wires inside. Superficial electrodes are usually a pair of tin plates below 70 mm2. After the skin is cleaned with a mixture of alcohol and ether, the surface electrodes are glued to the skin via an electrolytic paste.
Electromyographic examination is performed in three stages: when the muscle is at rest, in a semi-contraction state, and in full contraction.
On the diseased muscle In the result of this examination, it is understood that the cadaveric condition is the muscle itself or the nerve. If the nerve is not working, it can be understood whether it is the brain or environmental factors. This examination, which has application field in neurology science, is mostly used in the case of stroke and muscle disorders. Share Bilgi Çoğalsın