OF THE NERVUS OCTA.VUS.' 



25 



caudal portion, but now parallel to the gronndplane in a level B. The 

 position would then be conform to the scheme, represented in fig. 10. 

 But such is not the actual position of the head. (See fig. 13). 

 Neither is the change in position, suffered by the cranial portion 

 of the median plane towards its cervical portion a simple moving 

 parallel to itself, in such a manner that (as in fig. 1 1) the cranial 

 portion , though standing vertically on the cervical portion , runs 



. ___ 1 



A 



Ca*4.c}u.~U>oMi . na 



Fig. \i. 



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

 retained its original position relative to its caudo-thoracic part. Seen from the right side. 



parallel to the thoraco-caudal portion that has retained its original 

 position in a plane C, parallel to A, where the latter is found. This 

 again is not the actual position of the head. (See fig. 13). 



The cranial portion of the medial plane of the body has made 

 a turning on its cervical portion and this movement has been made 

 towards the operated side. The cranial portion is forming an angle 

 of 90 or more with the cervical portion, and consequently a 

 position of the head is shown, as represented in the scheme of fig. 12. 



The caudo-thoracic portion of the median plane is still lying in 

 A. The cervical portion is standing in a plane B perpendicular to 

 A. The cranial portion of the median plane is lying in a plane 

 C . standing vertically both on A and on B. Within this plane 

 it may assume different positions, as shown in a , (2> and y. 



Rarely however positions, surpassing that which is represented 

 in y are found, because in that case the rolling round the hori- 

 zontal axis becomes necessary. 



