POWERPLUSWATERMARKOBJECT357922611 AUTOSHAPE 2 MOTOR UNIT AND ELECTROMYOGRAM (EMG) MOTOR

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POWERPLUSWATERMARKOBJECT357922611 1 PROLOGUE MORPHOLOGY IS THE AREABRANCH OF LINGUISTICS
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POWERPLUSWATERMARKOBJECT357922611 ABSTRACT OBJECTIVE ALTHOUGH PPERIOPERATIVE IMMUNEENHANCING ENTERAL FORMULA (IEEF)

The QT interval on the ECG is measured from the beginning of the QRS complex to the end of the T wave

POWERPLUSWATERMARKOBJECT357922611 AUTOSHAPE 2 MOTOR UNIT AND ELECTROMYOGRAM (EMG) MOTOR POWERPLUSWATERMARKOBJECT357922611 AUTOSHAPE 2 MOTOR UNIT AND ELECTROMYOGRAM (EMG) MOTOR POWERPLUSWATERMARKOBJECT357922611 AUTOSHAPE 2 MOTOR UNIT AND ELECTROMYOGRAM (EMG) MOTOR



POWERPLUSWATERMARKOBJECT357922611 AUTOSHAPE 2 MOTOR UNIT AND ELECTROMYOGRAM (EMG) MOTOR





Motor unit and Electromyogram (EMG)

Motor unit :

A single motoneuron [Remark 1] and it’s axons supply not only just a muscle fiber, but also several muscle fibers. The muscle fiber that is supplied by one motor neuron through its single axon along with branches are is called a Mmotor Uunit. The numbers of muscle fibers in a motor unit varies.vary. It is has been observed in cat leg muscles that in one motor unit, approximately 120­, 165 fibers are present.


Electromyogram (EMG)

A motor unit activity is measured through placing recorded by inserting a coaxial electrode in to the muscle that is to be studied. Then, the electrodesthey are connected to the electromyography. A recording is obtained during muscular activity . This recording is called an electromyogram (EMG).


A hypodermic needle can be made in to a coaxial electrode by introducing an insolatedinsulated inner wire with in it. Potential differences is are recorded from a small volume of the muscles in the immediate neighbuorhood of the tip of the needle tip. Thus, it is has been observed that most of the electrical activity is from the active fibers near the electrodes . Sometimes, surface electrodes is are used in stead of coaxial deep muscle electrodes. In this recording method, two surface electrodes are placed on the skin overlying the muscle, which is to be studied, over the to be studied muscle’s at a reasonable distance.


When the muscle is at rest, there is no action is potential recorded but ; however, as soon as the muscle becomes active, potentials are recorded. The potential recorded during Aactivity is attributed as a result of to the asynchronous discharge of motor units in the vicinity of the electrodes. During minimal voluntary activity, only a few number of motor units discharges, and as the voluntary effort increases, the more number of units is activated. This is called known as recruitment of motor units.


Gradation of muscular activity is a part of the function of a number of motor units activated. [Remark 2] Electromyographic studies have clinically importance in diagnosizs of motor unit disorders including peripheral nerve injuries, and neuromuscular disorders such as myotonia and myasthenia gravis, so on and so forth.


Remark 1: Note that the terms “motoneuron” and “motor neuron” have been used interchangeably throughout the manuscript. We have revised this for consistency. Please check.

Remark 2: Note that the highlighted text is unclear and please check whether it should be revised to “Gradation of muscular activity occurs when a number of motor units are activated” for clarity.


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POWERPLUSWATERMARKOBJECT357922611 AUTOSHAPE 2 MOTOR UNIT AND ELECTROMYOGRAM (EMG) MOTOR


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