THE STERNUM 



105 



clavicles. Occasionally a rounded pisiform bone is seen on each side, ini mediately 

 internal to the articular notch for the clavicle; these are the episternal Ijones. 

 The last sternebra, or xiphoid, is the least developed and, though calcified in old 

 age, rarely ossifies. Its tip is directly continuous Avith the linea alba, and the base 

 gives slight attachment to the rectus abdominis muscle. 



Fig. 113. — The Sternum. (Anterior view.) 



INTERCLAVICULAR NOTCH 



CLAVICULAR NOTCH 



FOR FIRST COSTAL CARTILAGE 



XIPHOID FORAMEN 



Sterno-mastoid 



MANUBRIUM OR PRE-3TERNUM 



Pectoralia major 



3LADI0LUS OR MESOSTERNUM 



Rectus abdominis 



Aponeurosis of trausversalis 

 and external oblique 



XIPHOID OR METASTERNUM 



The following muscles are attached to the sternum :- 



Pectoralis major. 

 Sterno-cleido-mastoid. 

 Internal intercostals. 

 Kectus abdominis. 



Triangularis sterni. 

 Transversalis. 

 Diaphragm. 

 Sterno-hvoid. 



Sterno-thvroid. 



