86 



Bones of the Upper Extremity. 



Tuberc. 

 maj-us 



TS-mi-ntntia, 

 capit 



107. The Eight Humerus, 



Os humeri, from before. 



The h u m e r u s forms at its 

 upper extremity the head, Caput 

 humeri, covered with cartilage; the 

 furrow below it is called the anatomi- 

 cal neck, Collum anatomicum, while the 

 surgical neck, Collum chirurgicum, lies 

 at the place of insertion of the M. 

 teres major (Fig. 109). Below the furrow 

 the lesser t u b e r o s i t y, Tuberculum 

 minus, projects forwards, while the 

 greater t u b e r o s i t y , Tuberculum 

 majm, projects outwards, being external 

 to the lesser; between both runs the 

 bicipital groove, Sulcus intertubercularis 

 (for the tendon of the long head of 

 the M. biceps). From the tuberosities 

 the Spina tuberculi major is and the Spina 

 tuber cut i minor is run downwards. 



At the external surface 

 of the shaft or middle p i e c o, which 

 has 3 surfaces, there is a rough triangu- 

 lar impression, Tuber on itas (place of 

 insertion of the J/. deltoides) ; at the 

 upper third of the inner border is the 

 Foramen nutritlum. 



At the lower e x t r e m i t y of 

 the humerus are: the t r o c h 1 e a, and 

 the cap Helium, Emimntia cap i tat a, 

 the former for articulation with the 

 ulna, the latter for articulation with 

 the radius. 



