THE CHEST CONTENTS. 193 



2. The upper sternal region extends from the suprasternal notch to a line 

 drawn opposite the third costal cartilages. 



3. The lower sternal region is behind the second piece of the sternum from 

 the third costal cartilages down. 



Anteriorly on the chest there are four regions (Fig. 212) : 



1. The supraclavicular region, above the clavicle. This includes the supra- 

 clavicular fossa. 



2. The infraclavicular region, below the clavicle down to the upper edge of 

 the third rib. 



3. The mammary region, from the upper edge of the third to the upper 

 margin of the sixth rib. This extends from the edge of the sternum to the anterior 

 axillary fold and has the nipple nearly in its centre. 



FIG. 212. The anterior regions of the chest. 



4. The inframammary region extends from the upper margin of the sixth 

 rib to the lower margin of the thorax. 



Laterally on the chest between the folds of the axilla there are two regions: 



1. The upper axillary region extends down to the upper border of the sixth rib. 



2. The lower axillary region extends from the upper border of the sixth rib 

 to the lower edge of the thorax. 



Posteriorly there are four scapular regions (Fig. 213) : 



1. The suprascapular region is above the spine of the scapula. 



2. The scapular region is the part covered by the body of the scapula below 

 its. spine. 



3. The infrascapular region is the part of the chest below the scapula between 

 its angle and the lower edge of the chest. 



4. The interscapular region is the part between the posterior edge of the 

 scapula and the median line. 



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