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15 Cards in this Set

  • Front
  • Back
Two major types of neurons are found in ventral horn
Alpha and gamma
Alpha motor neurons innervate _
Extrafusal fibers of skeletal muscles
Gamma motor neurons innervate _
Intrafusal fibers of skeletal muscle
Inhibitory interneurons are in which lamina
VII
Small alpha motor neurons innervate what muscles
Slow twitch fatigue resistant fibers
Large alpha motor neurons innervate what muscles
Fast twitch fatigue susceptible
Major contractile element is _
Extrafusal fiber
Muscle spindle is intrafusal/extrafusal
Intrafusal
2 types of fibers in muscle spindle
Nuclear bag and nuclear chain
Which portion of muscle spindle is non-contractile and is the receptor portion
CENTRAL
Primary group Ia fibers innervate _
bag and chain fibers
Primary (group Ia) fibers form _ endings
Annulospiral
Secondary (group II) fibers form _
flower spray
Spindles are aligned _ , receptors are in _
PARALLEL to extrafusal fibers

SERIES
Tension in receptor portion can be increased by contraction of _
EXTRAFUSAL FIBERS