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COMPARATIVE ANATOMY 



Pig. 408. — Ventral view and median section of the brain of Ornilhorhynchus . AC, 

 anterior commissure; bo, olfactory bulb; c, first cervical nerve; cl, cerebellum; CM, 

 massa intermedia; e, epiphysis; /, flocculus; fd, fasciculus dentatus (anterior part of 

 hippocampal tract); fi, interventricular foramen; h, hypophysis; he, habenular com- 

 missure; HC, pallial (hippocampal) commissure; Ip, piriform (hippocampal) lobe; 

 mc, mammillary bodies; mo, medulla oblongata; n, nodulus; ol, olfactory lobe; at, 

 olfactory tubercle; pal, pallium (temporal lobe); pc, posterior commissure; rf, rhinal 

 fissure; tc, tuber cinereum: tV, tuberculum quinti; v, velum medullare anterius; vm, 

 motor root of V nerve; vmd, mandibularis root of V; vtnx, maxillary root of V. (From 

 Kingsley's "Comparative Anatomy of Vertebrates," after G. Elliot Smith.) 



