249 
it round the bitemporal axis (360°), it is principally the obliqui 
which react, whereas the two eyes roll in the same direction. Starting 
from the normal position and turning the head round the occipital- 
caudal axis (360°), it is especially the recti superior and inferior 
which react, and the eyes show opposed vertical deviations. 
Starting from the side-position and turning the head round its 
venter-dorsal position (360°), both groups of strings react and 
the eye-positions are the combined results of opposed vertical devia- 
tions and rotatory movements equally directed. 
6. After extirpation of the labyrinth on one side the vertical 
deviations of the eye and the rotatory movements continue for both 
eyes. One labyrinth influences the obliqui of both eyes and the 
rollings in the same sense; however the recti (sup. and inf.) of the 
two eyes and the vertical deviations of the eyes are influenced in the 
opposed sense. 
For both eyes one labyrinth brings about the greatest vertical 
deviation of the eye with respect to its normal positions when it 
is lowest down, whereas the head is in side-position. Then the rectus 
super. of the same side and the rectus inf. of the crossed side are 
in a state of greatest contraction. 
One labyrinth brings about, for both eyes, the greatest rotatory 
movements by contraction of the oblig. infer., when the head stands 
with its muzzle vertically downward. 
On the other hand the greatest rotatory movements of both eyes 
by contraction of the obliqui superior are brought about by one 
labyrinth, when the head stands with its muzzle vertically upwards. 
| 
| 
CE end 
p 
4 
eo 
Obl, sup Os e eo 
oft wf Osse | beer Obl inf 
IL R 
eben Keck. sup, 
epe ing Roect. inf II 
Boeck. int. O Ben 
Fig. 5. 
