844 



COMPARATIVE ANATOMY 



Comparison of Various Types of Brains. A-F (Edinger) are sagittal sections 

 showing structures lying in the median line and also paired structures (e.g., 

 pallium) lying to one side of the median line. The cerebellum is black. It is 

 doubtful whether the membranous roof in A indicated as pallium is strictly 

 homologous with that structure in other forms. In B, Pallium indicates prepallial 

 s-tructures, Aq.Syl., Aquseductus Sylvii ; Basis mesen., basis mesencephali ; Bulb, olf., 

 bulbus olfactorius ; Corp. striat., corpus striatum ; Epiph., epiphysis ; G.h., ganglion 

 habenulae ; Hyp., hypophysis ; Infund., infundibulum ; Lam.t., lamina terminalis ; 

 Lob. elect., lobus electricus ; L.yagi, lobus vagi ; L.opt., mid-brain roof ; Med.obl., 

 medulla oblongata ; Opt., optic nerve ; Pl.chor., plexus chorioideus ; Rec.inf., 

 recessus infundibuli ; Rec.mam., recessus mammillaris ; Saccus vase., saccus vas- 

 culosus ; Sp.c., spinal cord; vent., ventricle; v.m.a., velum medullare anterius ; 

 v.m.p., velum, medullare posterius. G and H show the mesial surface of the cerebral 

 hemispheres in a low (G) and high (H) Mammal. G Elliott Smith, Edinger, 

 slightly modified. The exposed gray matter of the olfactory regions is shaded, the 

 darker shade indicating the archipallium (preterminal area and hippocampal 

 formation), the lighter shade indicating the rhinencephalon, which consists of 

 the anterior and the posterior (principally pyriform) olfactory lobes, and a 

 central region made up of the hippocampus and the following gyri : fornicatus. 

 dentatus, uncinatus, introlimbicus, fasciolaris, and Andrae Retzii. 



