THE SKELETON. 



inward, then, becoming smaller, it changes its direction and passes forward and 

 outward. The ascending portion, flattened from before backward, presents in 

 front a smooth, concave surface over which passes the Subscapularis muscle. The 

 horizontal portion is flattened from above downward, its upper surface is convex 

 and irregular, and gives attachment to the Pectoralis minor ; its under surface is 

 smooth ; its inner border is rough, and gives attachment to the Pectoralis minor ; 

 its outer border is also rough for the coraco-acromial ligament, while the apex is 

 embraced by the conjoined tendon of origin of the short head of the Biceps and 

 of the Coraco-brachialis and gives attachment to the Costo-coracoid ligament. At 

 the inner side of the root of the coracoid process is a rough impression for the 

 attachment of the conoid ligament ; and running from it obliquely forward and 

 outward on the upper surface of the horizontal portion, an elevated ridge for the 

 attachment of the trapezoid ligament. 







Structure.-In the head processes, and all the thickened parts of the bone the 

 scapula is composed of cancellous tissue, while in the rest of its extent it is com- 

 sninonff a thln * a JT f dense > com P act tissue. The centre part of the supra- 

 fo n? '"if the ^ Part f the inf -spinous fossa, but especially the 



former, are usually so thin as to be semitransparent ; occasionally the bone is 



% ^mfn^ hiS ^ ati r "^ the ad J aCent mukes come into con 'act 

 the or, If (% 96 )'-% *^ or more centres: one for the body, two for 



one 



f 



of 



SCapula comraen <^ about the second month of 

 thdonod - m p lar qlril*teral plate- of bone immediately 



bo 1 g tlT y '- ThlS Pkte 6Xtends itself so as to form tbe c1 ^ Part 



bone, the spine growing up from its posterior surface about the third month 



