Ated.cbl 



— Sp. cd 



2Sp~ 



Cer'H 



/' -^ ur Med cbl 



Sfi cd 



I III MUM III! W I I ^ ^^ 



Cptch //z/' "Jl / / & 



Cer.f/ fcr.M 



cptoCpfl^^ ch pl.v.2 



Clfl 



Afed., 



Ch.plx' 



' irtf ptt 



Fig. 83. — Brain of frog. A, dorsal side; B, ventral side; C, left side; D, in vertics 

 longitudinal section through the middle. Cb, cerebellum ; Cer.H, cerebral hemispheres 

 ch.plx"^ anterior, and ck.plx' posterior, choroid plexus; com, commissures connecting 

 the right and left halves of the brain; Cr.C, crura cerebri; Di, diencephalon, or thala- 

 mencephalon ; for.M, foramen of Monro; /, iter, or aqueduct of Sylvius ; itij , intun- 

 dibulum; Afed.obl, medulla oblongata; O//."/, jalfactory lobe; Opt.L optic lobe; opi.v, 

 optic vesicle; /«», pineal hodv; p'it, pituitary fiody; Sp.cd, spinal cord; z^, third ven- 

 tricle; v^, fourth ventricle; l-X, cranial nerves; / Sp, 2 Sp, first and second spinal 

 nerves. (From Parker and Parker's Zoology, after Gaupp and Osborn.) 



292 



