Motor units and their’s relation with electromyograms (EMG)

Comment [A1]: Abbreviations are not usually
included in the titles or articles.

Motor unit :A single motor neuronmotoneuron and itsit’s axonaxons innervatesupply not only just amuscle fiber, but also several muscle fibers. The mMuscle fibers that is supplied innervatedby one motor neuron through its single axon along with branches are called a Mmotor Uunit.
The numberA variety of numbers of muscle fibers in a motor unit variesare present . It is has
been observed in cat leg muscles that approximately 120–, 165 fibers are present in one
motor unit.
Electromyography:EMG
A Mmotor unit activity is measured bythrough insertingplacing a coaxial electrode in to themuscle that is to be studied. Next, the electrode isthey are connected to anelectromyographelectromyography (EMG) and a. A recording is obtained during muscular
activity, . This recording is called an electromyogram (EMG).
A hollow needle can be made intoin to a coaxial electrode by introducing an
insulatedinsolated inner wire with in into it. CPossible changes are recorded from the small
volume of the muscles in the immediate vicinityneighbuorhood of the tip of the needle. Thus,
it is has been observed that most the of highest the electrical activity is observed from in theactive fibers near the electrodes. Sometimes, surface electrodes areis used in stead of deep
muscle coaxial electrodeselectrode. In this recording method, two surface electrodes areplaced over the muscle to be studied muscle’s at a reasonable distance.
When the muscle is at rest, no action is potential is recorded; however, as soon as the muscle
becomes active, action potentials results fromare recorded. The potential recorded during
activity is as a result of the asynchronous discharge of motor neuronsmotoneurons in thevicinity of the electrodes. During minimal voluntary activity, only a few number of motor

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Comment [A2]: We have changed “it’s” to “its”
because this is a case of a possessive pronoun. The
use of “it’s” is incorrect because “it’s” a contractionof “it is” or “it has.”

units are dischargeddischarges, and as voluntary effort activity increases, the more numberof units areis activated. This is called recruitment of motor units.
Gradation of muscular activity is a function of thea part of the function of a number of motor
units activated. ElectromyographicElectromyographc studies are clinically importanthaveclinically importance in the diagnosisdiagnosiz of motor unit disorders, including peripheral
nerve injuries, and neuromuscular disorders, such asincluding myotonia and myasthenia
gravis, so on and so forth.

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Comment [A3]: Redundant phrases make asentence wordy. Being economical in writing
enhances clarity (in terms of meaning) andreadability of the sentence. Here, the phrase “so onand so forth” is not required as this is implied by theuse of “including.”