TOPOGRAPHY OF THE THORAX AND ABDOMEN I I 



Plates XXX and XXXI). The plane connecting the two 

 midaxillary lines is the midaxillary plane. 



The terms right and left are used as applied to the body 

 of the subject and not to that of the observer, e. g. the apex 

 of the heart is on the left side of the subject and opposite 

 the right side of the observer. 



The term section refers to one of the parts into which 

 the body is cut. A section is located by the level of its 

 upper surface, as section X is through the seventh thoracic 

 vertebra posteriorly and the third intercostal muscles anter- 

 iorly because in making this section these structures were 

 cut by the knife and saw. 



