24 



C. WINKLER. THE CENTRAL COURSE 



sometimes even also the thoraco-cervical portion of the median 

 plane is turning towards the operated side. 



Consequently the cervical portion of the median plane of the 

 body is no longer lying in the prolongation of the cando-thoracic 

 portion of this plane. It is forming with this latter an angle of 

 90 , and runs therefore parallel again to the ground-plane , on 



Fig. 10. 



Scheme of the medial plane, if only its cervical part was turned 90, and if its cranial part had 

 retained its original position relative to its cervical part. Seen from the right side. 



which the caudo-thoracic portion of the median plane of the body 

 is standing vertically. 



In the meantime however the cranial portion of the median 

 plane of the body has also taken a turning, as it would not main- 

 tain its original position towards the cervical portion because of 

 the changed position , assumed by this latter towards the caudo- 

 thoracic portion. If its original position had been maintained , then 

 the cranial and cervical portions of the median plan of the body 

 would still form one plane , standing vertically on its thoraco- 



