THE NUMBER OF MUSCLE-SPINDLES IN CERTAIN MUSCLES IN CAT IN RELATION TO THE COMPOSITION OF THE MUSCLE NERVES

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Abstract
In adult cats the gastrocnemius medialis ''muscle contained 45 muscle spindles, the soleus 56, and the tibialis anterior 57. The distr. of spindles is pictured. The nerve fibers to these muscles were grouped according to thickness. The number of muscle spindles and the number of afferent and efferent fibers were compared. They consider all or most of the small efferent fibers as motor fibers to the muscle spindles. The ratio of such small nerve fibers to the estimated number of motor end plates in three muscles was: for the gastrocnemius medalis about 115 fibers to 540 end plates; the tibialis anterior 206 fibers to 545 end plates; and the soleus 90 fibers to 672 end plates. The fibers must therefore branch a number of times.

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