5 14 



TIF RABBIT 



a thin wall, the /amina tcrminalis {I. /), and extends into the 

 infundibulum below. At its anterior end are the foramina 

 of Miinro (f m), leading into the middle of the lateral 

 ventricles in the hemispheres (Fig. 131). In this region 

 each lateral ventricle is broad from side to side, but narrow 

 from above downwards ; it extends forwards into the frontal 



.^ a.co. 7 /- ^ 

 oif 'f- 2" 



/i. "■lApttAm-co. Jit 



Vie,. 132. — Rabbit. Longitudinal vertical section of the Rabbit's brain (nat. .'^i/e). 

 Letters as in preceding figure ; in addition cb. central lobe of cerebellum, showing 

 arbor vitie ; c. c. crus cerebri ; c. li.^ parietal, and c. /?.- temporal lobe ol 

 cerebral hemisphere ; c. itia. elevation behind the infundibulum ; f, vt. foramen 

 of Monro ; in/, infundibulum ; /. t. lamina terminalis ; ly. part of hippocampus ; 

 tn. o. medulla oblongata ; o. ch. optic chiasma ; J>ty. pituitary body ; vl. if. 

 choroid ple.xus ; //.optic nerve. (From Parker's /i^r'^'t?;//!'.) 



lobe, backwards into the parietal lobe, and downwards into 

 the temporal lobe. The olfactory lobes are solid. 



A prominent, convex ridge of wliite matter — the hippocampus (Fig. 

 131, Jip. Jti.) projects into the inner side and floor of each lateral ven- 

 tricle where it descends into the temporal lolie, and closely applied to it 

 is a continuation of the choroid plexus (ch, pi), which passes from the 

 the roof of the third ventricle into the lateral ventricle through the 

 foramen tif M(.)nro. In front of the hippocampus the outer side and 

 floor of the anterior part of the lateral ventricle is thickened to form nn 

 eminence of grey matter, the corpus strialiim (cp. s) Just beneath llio 

 corpus callosum the internal wall of each lateral ventricle is thin, and 

 is known as the septum liicidum (sp, lii) ; and below it and above the 

 foramina of Monro is another commissure known as the body of the 

 fonii.x (Figs. 131 and 132, b, fo) which is continuous on each side with 



