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March 6, 1943


Author Affiliations

Salt Lake City. Associate Dean, University of Utah School of Medicine.

JAMA. 1943;121(10):784. doi:10.1001/jama.1943.02840100070028

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To the Editor:—  I have just read the editorial "Advances in Muscle Physiology" in the January 30 issue of The Journal. The last sentence states that the muscle of the body comprises approximately 25 per cent of the total body weight. I feel quite sure that this figure is wrong. Scammon states in the first chapter of Morris's Human Anatomy that "the voluntary musculature forms about one quarter of the body in the later part of fetal life and at birth, and increases about twofold in relative weight by maturity."Harry A. Wilmer (Changes in Structural Components of the Human Body from Six Lunar Months to Maturity, Proc. Soc. Exper. Biol. & Med. 43:545 [March] 1940) states that "the postnatal changes in the relative distribution of components consist of a marked increase in the voluntary muscle from about one fourth to over two fifths of the body mass." A

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