PowerPlusWaterMarkObject357922611 Motor UUnit’s Relation With And Electromyogram (EMG) Motor

powerpluswatermarkobject357922611 motor uunit’s relation with and electromyogram (emg) motor unit : a single motoneuron and it’s axo

PowerPlusWaterMarkObject357922611
Motor uUnit’s relation with and Electromyogram (EMG)
Motor unit :
A single motoneuron and it’s axons innervatessupply not only just a
muscle fiber, but also several muscle fibers through its axon. AThe
group of muscle fibers that is innervatedsupplied by one motor neuron
through its single axon and axonalalong with branches are is called a
Mmotor Uunit. A The number of variety of numbers of muscle fibers in a
motor unit varies are present . It is has been observed in cat leg
muscles that approximately 120­, –165 fibers are present in one motor
unit.
Electromyogram (EMG)
A mMotor unit activity is measured through placing recorded by
inserting a coaxial electrode in to the muscle that is to be studied.
Next, the electrodesthey are connected to the electromyography (EMG).
A recording, called an electromyogram, is obtained during muscular
activity. This recording is called an electromyogram (EMG).
A hollow hypodermic needle can be made converted in to a coaxial
electrode by introducing an insolatedinsulated inner wire with in it.
Possible changes Potential differences are recorded from a small
numbervolume of the muscles fibers 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 electrodesdeep muscle coaxial electrode. In this recording
method, two surface electrodes are placed on the skin overlying the
muscle under study over the to be studied muscle’s at a reasonable
distance from each other.
Action potential is recorded when the muscle becomes active but not
Wwhen the muscle is at rest, no action is potential recorded; however,
as soon as the muscle becomes active, potentials are recorded. The
potential recorded during activity is attributed as a result of to the
asynchronous discharge of motoneurons in the vicinity of the
electrodes. During minimal voluntary activity, only a few the number
of motor units discharged is lesss, and as the voluntary effort
increases, the more the number of units is activated is more. This is
called known as recruitment of motor units recruitment.
Gradation of muscular activity is a part of the function of a number
of motor units activated. 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.
All material in this document is the intellectual property of Crimson
Interactive Pvt. Ltd. The use of information and content in this
document in whole or in part is forbidden unless express permission
has been given in writing by Crimson Interactive Pvt. Ltd.
www.enago.com | www.enago.jp | www.enago.com.tr | www.enago.com.br |
www.enago.de | www.enago.tw
www.enago.cn | www.enago.ae