BRAIN 



20' 



r.o 



A" 



FIG. 155. BRAIN OF MVXINE. (After G. Retains.) A, dorsal; B, ventral; 

 C, lateral view. The olfactory organ and its cartilaginous skeleton (r.o) is 

 left in situ. 



a, eye; g.h, ganglion habenulse ; HH, cerebellum; //, vestigial optic nerve; 

 M H, mid-brain ; NH, medulla oblongata ; pi, infundibular process ; r, 

 spinal cord ; rb, olfactory lobe ; a, spinal nerves (dorsal roots and ganglia) ; 

 F 1 , 2 , 3 , trigeminal ; VII, telencephalon ; VII, facial ; VIII, auditor}- ; X, 

 vagus ; A' 1 , sensory branch of vagus or dorsal branch of a spino-occipital 

 nerve. 



