258 H. W. NORRIS 
skull through its foramen in the orbito-sphenoid bone it passes 
anteriorly along the inner border of the ramus ophthalmicus 
profundus V, and, after reaching the transverse level of the pos- 
terior border of the eyeball, passes around the ventral border of 
the above-mentioned ramus to its destination. 
Fig.11 A cross-section slightly posterior to the preceding. Section 300. X20 
The oculomotor nerve arises in the usual fashion from the ven- 
tral longitudinal column in the midbrain (fig. 12). On leaving 
the brain it runs antero-laterally out to the inner border of the 
orbito-sphenoid cartilage (figs. 10, 11) along which it passes to 
its foramen in the latter. While passing through this foramen 
it divides into two branches, one of which passes anteriorly dorsal 
to the ramus ophthalmicus profundus V to innervate the rectus 
