author's abstract of this paper issued 

 by thk bibliookaphic service, decemher 1 



THE POSITION OF THE INSERTION OF THE PECTO- 



RALIS MAJOR AND DELTOID MUSCLES ON 



THE HUMERUS OF MAN 



ADOLF H. SCHULTZ 



Carnegie Institution of Washington 



THREE FIGURES 



The metrical determination of the position of the attachments 

 of muscles to bones is a problem which affords a contribution to 

 topographicaJ anatomy. It is also of importance from the 

 standpoint of musculo-mechanics, because measuring the inser- 

 tions of muscles is analogous to the determination of the lengths 

 of leverage of the body. Since such an investigation promises 

 to give information regarding differences or equalities of race or 

 sex, as well as of the two halves of the body, it is of no less in- 

 terest to the anthropologist. As far as the author can determine 

 from a study of anatomical and anthropological literature, no 

 measurements of the insertions of muscles have as yet been 

 undertaken. In approaching this problem one is working in a 

 new field of osteometry, where it becomes necessary to treat the 

 bone not separately but in conjunction with the associated mus- 

 cles, W'hich have been so neglected in anthropometry. 



The following study deals with the insertion of the pectoralis 

 major and deltoid muscles. The measurements were made on 

 the right and left arms of one hundred and five bodies. Forty- 

 six of these bodies were obtained from the University of Mary- 

 land in Baltimore, forty from the Jefferson Medical College in 

 Philadelphia and nineteen from the Johns Hopkins Medical 

 School in Baltimore. The author wishes here to express his ap- 

 preciation to r)rs. W. H. Lewis, J. P. Schaeffer, J. Holmes Smith 

 and J. W. Holland for their kindness in permitting the use of 

 this material. All of the subjects measured were adults; juvenile 

 and senile ones were excluded. It is regrettable that the sexes 



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