228 



APPLIED ANATOMY. 



endeavor to increase his skill by taking advantage of every opportunity that offers 

 for examination. In the case of women the same thing usually exists, but to a less 

 degree. In the somewhat emaciated adult male the structures can be recognized to 

 best advantage. 



The clavicle is subcutaneous, and even in children and fat people can be felt 

 throughout its entire length. Its large, knob-like inner extremity projects consider- 

 ably above the upper edge of the sternum, which can be felt at the suprasternal notch. 

 Take particular notice of its size and compare it with the one on the opposite side so 

 as not to be misled as to its being diseased or luxated. Follow the bone to its outer 

 extremity, which is higher than the inner, more so when lying down than when 

 standing. A prominent ridge marks its outer extremity; if it is difficult to recognize, 



Infraclavicular triangle 

 Outer end of clavicle 



Tip of acromion process 

 Greater tuberosity 



Head of humerus 

 Deltoid muscle 



Coracoid process 



Lesser tuberosity 

 Pectoralis major 



FIG. 241. Surface anatomy of the shoulder. 



as will often be the case, then continue directly outward to the point of the shoulder, 

 which is formed by the tip of the acromion process. Having recognized this point, 

 the end of the clavicle will be found about 2.5 to 3 cm. (i to i^in. ) directly inward 

 from it. 



In the median line above the sternum is the suprasternal notch with the promi- 

 nent sternal origins of the sternomastoid muscles on each side. Just to the outer edge 

 of these tendons lie the sternoclavicular joints. The one on the right side marks the 

 ending of the innominate artery and the commencement of the right common carotid 

 and subclavian. That on the left marks the left carotid with the subclavian directly 

 to its outer side and a little posteriorly. 



If the head is extended and turned to the opposite side the clavicular origin of 

 the sternomastoid is made visible. It arises from the inner third of the bone. 



