“The neuromuscular spindles are present in the majority of voluntary muscles, and consist of small bundles of peculiar muscular fibers (intrafusal fibers), embryonic in type, invested by capsules, within which nerve fibers, experimentally shown to be sensory in origin, terminate.”
“The large medullated nerve fibers passing to the end-organ are from one to three or four in number; entering the fibrous capsule, they divide several times, and, losing their medullary sheaths, ultimately end in naked axis-cylinders encircling the intrafusal fibers by flattened expansions, or irregular ovoid or rounded disks (Fig. 939).”
“Each is enclosed in a capsule which contains a number of enlarged tendon fasciculi (intrafusal fasciculi).”
“Effect of hindlimb unloading on resting intracellular calcium in intrafusal fibers and ramp-and-hold stretches evoked responsiveness of soleus muscle spindles in conscious rats.”
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