216 



COMPARATIVE ANATOMY 



\lcct.cbl 



rifi 



i- < X' c b chplx.2 



Sp cd 



FIG. 164. BKAIX OF FROG[(Rana temjiontriit). A, from above; B, from below ; 

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

 1), after Osborn.) 



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

 anteroid choroid plexus (removed in A) ; rh.jdx*', posterior choroid plexus 

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

 (below), anterior commissure and anterior pallia! commissure just above it ; 

 Cr.C, crura cerebri ; JJi, diencephalon ; for. J/, foramen of Monro ; i, iter ; 

 inf, infundibulum ; Med.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 : r\ third ventricle ; v 4 , fourth 

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

 second and third) spinal nerves. 



