THE SKELETAL SYSTEM 



155 



Development of the Sternum. The sternum arises from connective 

 tissue which is afterwards chondrified to become a pair of cartilaginous 



PHALANGES.-j^ 

 METACARPALS, - 



MANDIBLE. 



/CLAVICLE. 



ACROMION PROCESS. 



CORACOID. 



MANUBRIUM. 

 STERNUM. 

 XIPHOID PROCESS. 



-HUMERUS. 



RADIUS. 



Stt-carpals. 



PHALANGES. 



Fig. 145. — Human skeleton viewed from in front. (Reproduced in modified form 

 from "The Human Body" by Dr. Logan Clendening, (Copyright 1927, 1930 by Alfred 

 A. Knopf, Inc.) by permission of and special arrangement with Alfred A. Knopf, Inc., 

 authorized publishers.) 



bars, which secondarily unite in the mid-ventral line and only later 

 connect with the costal cartilages. Ossilication begins in a series of paired 



