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TSM 9
Motor Neurones
8
Medical
Undergraduate 2
11/09/2012

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Cards

Term
What are the 2 types of motor units?
Definition
Type I & type II
Term
What is the difference between type I and type II muscle fibres?
Definition
Type I are slow; the muscle cells have a low force and a low fatigability
Type II are fast; the muscle cells have a high force and a high fatigability
Term
How is the force of motor units controlled?
Definition
Increased discharge from a motor unit or increased recruitment of motor units
Term
What are the 2 types of LMNs?
Definition
Alpha and Gamma
Term
What are the 2 roles of muscle spindles?
Definition
They are stretch receptors; proprioception and motor reflexes
Term
What is the motor supply of muscle spindles?
Definition
Gamma motor neurons
Term
What are the 2 types of gamma motor neurons?
Definition
Ia: Length and stretch sensitive
II: Length sensitive only
Term
What is tested in the tendon jerk reflex?
Definition
A Ia monosynaptic connection
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