A COMPOSITE STUDY OF THE SUBCLAVIAN AETERY IN 



MAN. 



BY 



ROBERT BENNETT BEAN, M. D. 



Assistatit in Anatomy, Johns Hopkins Medical School, Baltimore, Md. 



With 7 Figures and 18 Tables. 



Several years ago Hitzrot' made a study of the axillary artery based 

 upon records made in the Anatomical Laboratory of the Johns Hop- 

 kins University. To supplement this, the following study of the sub- 

 clavian artery was made at the suggestion of Dr. Harrison. The clini- 

 cal features relating to the artery are given in another article." 



That there is need for further data concerning the ramifications of 

 this artery is apparent when the accompanying figures, taken from a 

 number of universally recognized authorities, are compared. From them 

 it is seen, that, while certain branches such as the vertebral and in- 

 ternal mammary are represented in the same manner by all, there is the 

 widest divergence with regard to the other branches. 



The records which underlie the present study were made by myself, 

 from the dissections by students of anatomy, upon Bardeen's charts.' 

 Dissections from 129 subjects are recorded, 60 from the left side of the 

 body and 69 from the right side. Some of these records are complete to 

 the minutest detail; nearly all give the origin of the main branches; 

 while a few are incomplete, giving only the subclavian artery and some of 

 its branches, or only a few branches without the subclavian artery. The 

 distribution of the vertebral artery inside the skull was not worked out, 

 because many of the cadavers were not obtained .until after the brain had 

 been removed. The distribution of the internal mammary artery was 

 worked out completely in but 28 cases because of the removal of the ster- 

 num at the autopsy in the others. 



^Hitzrot, Johns Hopkins Hospital Bulletin, Vol. XII, 1901. 

 ''Bean, Johns Hopkins Hospital Bulletin, Vol. XV, 1904. 

 'Bardeen, Outline Record Charts, Johns Hopkins Press, Baltimore, 1900. 

 American Journal of Anatomy. — Vol. IV. 



