THE THORAX. 



B 



INTERCLAVICULAR NOTCH 



CLAVICULAR NOTCH 



BODY 



MANUBRIUIVI 



ENSIFORW PROCESS 



Fig. 24. THE STERNUM: A, FROM BEFORE ; B, FROM THE LEFT SIDE. (Drawn by D. Gunn. ) f 

 The Roman numerals indicate the articular surfaces for the corresponding rib-cartilages. 



in the firsb segment of the body, somewhat wider near the lower end of the body, and 

 finally narrowed at the junction with the ensiform process. It consists of light can- 

 cellated tissue, with a thin covering of compact bone. 



The manubrium (prcsternum) is the thickest part of the bone. Its anterior surface 

 presents a slight median elevation ; its posterior surface is smooth and somewhat con- 

 cave. Its upper border is divided into three deep notches ; the middle one is named 



