48 



A MANUAL OF ANATOMY 



clavicular depression there may be found, on the anterior aspect, 

 an ossicle, known as the episternal bone. The inferior border, which 

 is short and straight, articulates with the mesosternum, a disc of 

 fibro-cartilage intervening. In this situation there is a transverse 



Interclavicular Notch 



Sterno-cleido-mastoid 



Pectoralis Major 



Rectus Abdominis 



Clavicular Surface 



Fcr ist Costal Cartilage 



Fig. 33. — The Sternum (Anterior Surface). 



elevation, called the sternal angle, which serves as a guide to the 

 second rib at either side. Each lateral border slopes downwards 

 and inwards. The upper part presents a triangular depression for 

 the first costal cartilage, and close to the lower part a demi-facet 

 for a portion of the second costal cartilage. 



