216 



COMPARATIVE ANATOMY 



-Sfi.cd 



^^VH 



Cfrtch inf / I ~TI W 



Ln J m pa v 



Cer.H fcr.M -" - 



^ \ < 



> x ' s * 



FIG. 164. BRAIN OF FROG (Rana temporaria). A, from above; B, from below ; 



C, from the side ; D, in longitudinal vertical section. (A C, after Gaupp ; 



D, after Osborn.) 



Cb, cerebellum; Cer.H, cerebral hemispheres; ch.plx 1 , in A, paraphysis, in D, 

 anteroid choroid plexus (removed in A) ; ch.plx' 1 , posterior choroid plexus 

 (tela choroidea) ; Com (above), superior and posterior commissures ; Com 

 (below), anterior commissure and anterior pallial commissure just above it ; 

 Cr. C, crura cerebri ; Di, diencephalon ; for. M, foramen of Monro ; i, iter ; 

 in/, infundibulum ; JMed.obl, medulla oblongata ; Off. I, olfactory lobe ; opt.ch, 

 optic chiasma ; Opt. I, optic lobe ; opt.v, optic ventricle ; pin, stalk pineal of 

 body ; pit, pituitary body ; Sp.cd, spinal cord : v*, third ventricle ; v 4 , fourth 

 ventricle; I-X, cerebral nerves ; 1 Sp, 2 Sp, first and second ( = embryonic 

 second and third) spinal nerves. 



