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What do Alpha Motor Neurons do?
Stimulate muscles
What are the efferent spinal neurons?
What do Gamma Static Neurons do?
Contract nuclear chain fiber
What do Gamma Dynamic Neurons do?
Contracts nuclear bag fiber
What do Gamma Motor Neurons do?
Innervate the base (near tendon) of muscle spindle fibers to modulate sensitivity of muscle to dynamic and static stretch
Muscle spindles are composed of:
Nuclear bag and nuclear chain (intrafusal) fibers
Where is a muscle spindle contractile and where is it not? What does this mean?
Contractile on ends, non-contractile in the middle. Makes it part muscle and part neural cell.
What happens when the midpoint is stretched?
Nerve endings of dorsal root ganglion cells are excited.
What do A-alpha (primary) sensory fibers contact? What do A-beta (secondary) sensory fibers contact?
What are muscle spindle afferents excited by?
Muscle spindles are connected to:
Extrafusal (striated) muscle fibers
What does excitation of spindle efferents do?
Maintains static and dynamic load.
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