450 



Comparative Morphology of Chordates 



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W MM1I IT MM Md 



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Fig. 348. Brain of Rana esculenta. (A) Dorsal, (B) ventral, and (C) lateral 

 view. {HID Cerebellum; (Hyp) hypophysis; (Jnf) infundibulum; (L.ol.) olfactory 

 lobe; {Med) spinal cord; (MH) midbrain; (NH) medulla oblongata; (Tr.opl.) optic 

 tract; (VH) cerebral hemispheres; (ZH) thalamencephalon; (I—X) cranial nerves; 

 (XI) accessory, not detached from vagus: (I a") lateral root of olfactory nerve; 

 (XII(\)) ventral root of first spinal nerve (hypoglossal?), and (1) its dorsal root; 

 (t) space between the two hemispheres. (From Wiedersheim : "Comparative Ana- 

 tomy of Vertebrates." By permission of The Macmillan Company, publishers.) 



