92 



Bones of the Upper Extremity. 

 Tuberositas coracoidea 



Bebiml 



Extremitas 

 acromialis 



In front 



I:\HM mitas sternalis 



113. Right collar bone or clavicle, clavicula, from above. 



Facies articularis acromialis 



r.vl remit as 

 sternalis 



Tuberositas coracoidea 

 Behind 



Tuberositas cost alls 



I'.xliM-mitas 

 acromialis 



Facies articularis sternalis 



114. Right collar bone or clavicle, clavicuta, from below. 



The clavicula (key, clavicle or collar bone) is a short, strong, cylindrical hone bent 

 co-like which runs transversely in front of the first rib, going out on each side from the 

 upper end of the sternum, and is attached at its lateral extremity to the acromion scapulae. 



It is divisible into a shaft and two extremities; that directed toward the sternum, 

 extremitas sternalis, and that looking toward the scapula, extremitas acromialis. 



The shaft is bent convexly forward [in its medial half; in its lateral half convexly 

 backward. It is triangular with rounded angles especially medianward. The extremitas 

 sternalis ends with the approximately triangular, curved fades articularis sternalis covered 

 with cartilage, which lies in the incisura clavicularis sterni. Somewhat lateral ward from it, 

 at the junction of the inferior with the posterior surface, the tuberositas coslalis (0. T. Im- 

 pression for rhomboid ligament) (for the lig. costoclaviculare) is visible. The extremitas 

 acromialis is somewhat broadened and is flattened from above downward; at its extreme end 

 it is turned somewhat forward and supports there the small, oval, flat fades articularis 

 acromialis for articulation with the facies articularis acromii scapulae. Just medianward, near 

 this, on the lower surface lies the oblong, rough tuberositas coracoidea (0. T. impression for 

 conoid ligament) (for the lig. coracoclaviculare). 



