3. Muscle Fnx and Analysis Flashcards
“Primary mover”
– Often considered as functional muscle group
• “elbow flexors”
– responsible for the initiation and execution of a
specific action at a joint
Agonists –
oppose or reverse the action of
the prime mover
• Antagonists –
assist the prime mover in its
actions
• Synergists –
Describe the concept of Recipricol Inhibition
Skeletal muscle functions usually includes pairs of muscles
• Depending on the muscle function one of the
pair muscles work as the agonist muscle and
the other the antagonistic muscle
For maximal muscle efficiency, speed and control
muscle pairs will:
– Increased tone in preparation for full activation
(getting the slack out)
– antagonist muscle prepares to slow down/ stop the
intended function
– The muscle pair need to coordinate their contractions to
avoid muscle injury
In neurologically intact patients, ________
reciprocal inhibition contributes to antagonist
suppression during movement
group Ia-mediated
When an individual axon is depolarized, an
_______l propagates down the nerve.
action potential
• Depolarization of all the fibers in a motor unit
creates an electrical potential called.
motor unit action potential (MUAP)
serves as the foundation for electromyography.
Analysis of the MUAPs (size, complexity, firing frequency) and assessment of baseline electrical signal at rest
How do we assess muscle function
clinically?
Manual muscle testing
• Motion analysis
• Electromyography
nerve compression, hereditary or acquired diseases, or
myopathy can be diagnosed via:
Electromyography and Nerve Conduction Studies
________ studies test motor, sensory, mixed
nerves
Nerve conduction
__________ tests skeletal muscle fibers
• Standard needle electromyography mostly tests type I
muscle fibers
Electromyography
MUAPs generated by contraction of an individual
muscle can be recorded by using
a surface or needle electrode
This information can be used to monitor that muscle’s activity during a certain action and to assess the integrity of the muscle and the nerves supplying it.
MUAPs from individual muscle contraction
