lOG 



THE SKELETON 



Ligaments.— In addition to the ligaments proper to the costal cartilages, the 

 following require enumeration : — 



Interclavicular. Posterior storno-clavicular. 



Anterior gtcrno-clavicular. Interarticular fibro-cartilage. 



Linea alba. 



Fig. 114.— The Steknum. (Posterior view.) 



CLAVICULAR NOTCH 



Sterno-hyoid 



Sterno-thyroid 



TriangulariE atemi 



Diaphragm 



FOR ?lnST COSTAL CARTILAGE 



Blood-supply.— Tlie arteries of the sternum are derived mauily from the 

 internal nianimarv arteries by direct l^ranches termed sternal: many twigs are 

 furnished by the perforating "branches of the internal mammary, and also by the 

 terminal twigs of the aortic intercostals. , i * +v,o 



Development.— The sternum results from the fusion of the ventral ends oi tne 



