Bones of the Upper Extremity. 



89 



Acromion 



Tuberositas supraglenoidalis 



Processus coracoideus 



Cavitas glenoidalis 



Tuberositas infraglerioidalis 



110. Right shoulder blade, scapula, from without. 



The aiigulus lateralis scapulae becomes markedly broader externally and is marked 

 off from the rest of the shoulder blade by a shallow groove or neck, collum scapulae. The 

 surface which is turned lateralward, the cavitas glenoidalis, is somewhat concave and is 

 covered with cartilage ; it is nearly oval in shape and is broader below than above ; there is 

 a slight indentation in the upper part of the anterior margin. A roughness just above this, 

 the tuberositas supraglenoidalis (0. T. supraglenoid tubercle), gives origin to the caput longum 

 m. bicipitis ; another, larger, below it, at the uppermost end of the margo axillaris, tuberositas 

 infraglenoidalis gives origin to the caput longum m. tricipitis. 



Between the cavitas glenoidalis and the incisura scapulae, arising from the margo 

 superior, is the processus coracoideus (crows beak process) ; it is thick, rounded, runs first 

 forward and upward, and then, making a marked hook-like curve forward and lateralward, ends 

 in a blunt tip. Very rarely it is separate from the rest of the bone. 



