Motor control - Muscle
11 important questions on Motor control - Muscle
Define the I band, A band, H band and sarcomere
True or false: an adult muscle fiber is innervated by exactly one axon. This axon originates from an α-motor neuron
What is the motor end plate (mep)?
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What are other names for the motor end plate (mep)?
What is special about the synapse of the motor end plate?
It is a very active synapse, every motor neuronal action potential will cause an AP in the muscle fiber. Due to:
- large surface
- high density of postsynaptic receptors
What is meant with: tetanise of a muscle
What is a motor unit?
One motor neuron and all the muscle fibers it innervates (always in the same muscle)
A small motor unit is for precise control. All muscle fibers will be stimulated when the motor neuron is activated, so when only a few fibers are innervated by one motor unit it is precise
What is a motor neuron pool?
A group of motor neurons together innervating all the muscle fibers of a single muscle.
--> mapped in the ventral horn (somatotopy)
What is the size principle of motor neuron recruitment (Henneman)?
Which types of muscle fibers are there?
Intermediate
Fast (light)
What is the difference between a small and large motor unit?
Small unit:
- small, slow but fatigue-resistant muscle fibers
- small motor neuron
Large unit:
- large, fast but very fatiguable muscle fibers
- large motor neuron
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