10 Questions
What is the alpha motor neuron's diameter?
10–20 μm
What does the all-or-none law state about action potentials?
Any subthreshold stimulus will cause nothing
What is a motor unit?
A group of muscle fibers innervated by a single alpha motor neuron
What is the main characteristic of action potentials?
Sudden and brief changes in electrical potential
Where does the alpha motor neuron send projections?
Ipsilaterally out the ventral and dorsal rami
What is the first step in a nerve conduction study?
Taking a detailed history
Which nerves are the most easily studied in the upper extremity?
Median and radial nerves
Where are the recording electrodes placed for sensory nerve studies?
Over the sensory nerve
What is the purpose of performing needle electromyography (EMG) examination after nerve conduction studies (NCSs)?
To plan and interpret the needle examination based on NCS findings
What type of nerve can be easily stimulated and brought to action potential with a brief electrical pulse applied to the overlying skin?
Peripheral nerve
Test your knowledge of motor units and action potential with this quiz. Learn about the alpha motor neuron, muscle innervation, and the process of sending projections to muscles.
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