180 



Joints of the Upper Extremity. 



Capsula articularis 



Processus coracoideus 



Ligamentum transversum 

 scapulae superius 



Spina scapulae 



(sawed off 

 at its origin) 



M. biceps (Caput longum) 



Vagina 



niucosa inter- 



tubercularis 



Epiphyseal- 

 j unction 



231. Right shoulder joint, articulalio humeri. 



Frontal section through the same, from behind. 



(The vagina niucosa intertubercularis has not been opened in its whole length. Of the shoulder 

 blade only the lateral portion has been drawn.) 



Articulatio humeri (continued). It presents regularly two bulgings of its capsula arti- 

 cularis. The one bulging, bursa m. subscapularis (see also Fig. 346) lies between the upper part 

 of the m. subscapularis and the joint capsule, is ovale and extends to below the root of the 

 processus coracoideus; it is -connected with the joint cavity by an opening situated a little 

 below the ligamentum coracohumerale. 



The second bulging of the capsula articularis is the vayina mucosa inter tuber cularis 

 (see also Fig. 346). It surrounds the tendon of the caput longum m. bicipitis as a tubular 

 cylindrical canal, is in free communication at its upper extremity with the joint cavity and 

 lies close to the bone in the region of the sulcus intertubercularis which is covered with carti- 

 lage above; it ends in the form of a blind sac in the region of the collum chirurgicum where 

 the stratum synoviale of the capsule is reflected upon the tendon of the m. biceps, covering 

 over part of the same as it runs inside the joint cavity. 



