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Lecture 9
Reflex Circuits
9
Physiology
Undergraduate 2
02/13/2011

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Term
monosynaptic
Definition
2 neurons
1 synapse on spinal cord
Term
muscle spindle
Definition
-detects and relieves stretch by contracting
-addition of a load stretches the muscle and spindles, creating a reflex contraction
Term
golgi tendon
Definition
-detects and relieves tension
-protects muscle from heavy loads by causing muscle to relax and drop the load
Term
extrafusal muscle
Definition
regular muscle
Term
intrafusal muscle
Definition
muscles in muscle spindle
Term
alpha motor neuron
Definition
neuron that controls extrafusal muscle
Term
gamma motor neuron
Definition
controls intrafusal muscle
Term
if muscle is stretched
Definition
firing AP increases
Term
if muscle is contracted
Definition
firing AP decreases
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