4 6 



ANATOMY AND PHYSIOLOGY 



The seventh rib of the left side, inferior 

 surface. 



The costal groove is seen, to the borders 

 of which the intercostal muscles are at- 

 tached, thus completing a channel for in- 

 tercostal vessels and nerve. 



The tubercle is at the beginning of the 

 shaft; the articular surface marked a is a 

 part of the tubercle. 



FIG. 41. THE SEVENTH RIB. 

 a, articular surface for transverse process; b, neck. (Morris.) 



