() HANDBOOK OF ANATOMY 



Third row above, to second row of phalanges. 



The Clavicle is a long bone having a prismatic shaft, and at 

 its inner (sternal) end a rounded head ; while its outer (acromial) 

 end is flattened into a more or less square shape. The shaft 

 forms a double curve, being convex forwards internally and 

 convex backwards externally ; the upper surface, subcutaneous 

 throughout, is rounded and smooth ; the anterior border is 

 rough, internally for the attachment of the pectoralis major,, 

 and externally for that of the deltoid; the posterior border 

 is roughened internally for the attachment of the sterno-mastoid, 

 and externally, where the acromion process begins, there is a 

 tubercle, called the conoid tubercle, for the attachment of the 

 conoid ligament. The inferior surface is also rough ; at its 



Acromial Facet 



Sternal 

 Extremity 



FIG. 1. THE RIGHT CLAVICLE (SUPERIOR VIEW). 



sternal end there is a deep pit for the attachment of the 

 rhomboid ligament, and in its middle third a groove for the 

 subclavian muscle ; from the conoid tubercle, outwards and 

 forwards, proceeds an oblique ridge for the attachment of the 

 trapezoid ligament. 



The clavicle articulates internally with the upper end of the 

 sternum, and externally with the acromion process of the scapula. 



Ossification. The clavicle is the first bone of the body to 

 ossify, the process commencing in the shaft very early in foetal 

 life. The secondary centre, or epiphysis, appears at the sternal 

 end in adult life, and ossification is complete about the twenty- 

 fifth year. 



The Scapula is a flat, triangular bone having two surfaces, 

 anterior and posterior, and three margins, vertebral, axillary, and 



