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This Concept Map, created with IHMC CmapTools, has information related to: Muscle Spindles - Sara, extrafusal muscle fibers innervated by alpha motor neurons, CNS may alter sensitivity, sensory proprioreceptors detect changes in muscle length, intrafusal muscle fibers activated to contract, contract simultaneously via alpha-gamma coactivation, Muscle Spindles found in muscle belly, Muscle Spindles composed of intrafusal muscle fibers, center region do not contain contractile proteins, contraction of muscles by preventing overstretching, intrafusal muscle fibers have center region, intrafusal muscle fibers innervated by gamma motor neuron, Muscle Spindles regulate contraction of muscles, end regions contain contractile proteins, Muscle Spindles run parallel to extrafusal muscle fibers, gamma motor neuron maintain muscle spindle sensitivity, sensory dendrites of muscle spindle afferent, changes in muscle length convey to CNS, CNS via sensory nerve terminals, extrafusal muscle fibers activated to contract, intrafusal muscle fibers have end regions