A treatise on zoology . w outgrowths becomevery distinctly paired cerebral hemispheres passing far in front ofthe lamina terminalis. The corpus striatum is a thickening ontheir outer ventral wall. The communication of their cavities oneither side with the median 3rd ventricle (prosocoele) narrows into BRAIN 17 the foijimcii of Monro. Tlie loof of the prosencephala becomesthe palliiuu which acqnires snch an enormous development in thecerebral hemispheres of the highest ^^ertel)rates. From the olfactorylolies issue the nerves to the olfactory epithelium. The greatmodifications in the shape and r
A treatise on zoology . w outgrowths becomevery distinctly paired cerebral hemispheres passing far in front ofthe lamina terminalis. The corpus striatum is a thickening ontheir outer ventral wall. The communication of their cavities oneither side with the median 3rd ventricle (prosocoele) narrows into BRAIN 17 the foijimcii of Monro. Tlie loof of the prosencephala becomesthe palliiuu which acqnires snch an enormous development in thecerebral hemispheres of the highest ^^ertel)rates. From the olfactorylolies issue the nerves to the olfactory epithelium. The greatmodifications in the shape and relative size of the ditlerent paits ofthe l)rain in the Claniata are, of course, the outward manifestationsof the ditterentiation and orderly arrangement of the ganglion cellsand nerve-fibres into an elaborate system of tracts and nuclei,which cannot be described in this volume. (Brain of Fishes:Burne [7C], Burckhardt [70], Studnicka [429], Johnston [249].)A new paired cranial nerve of doubtful significance has recently. L();itiiiliii;il midiaii .sf(-tiiiu through the bruin of an fiiibryo Spinax viger. (After vo]iKuppfiT, from Hertwigs Hamihiich.) C, cerebelhiin : , posterior comrQissure ; nr, ; i\ epiphysis; e, paraphysis ; /./•, ilionibo-inesencephalic ; , liabenularjianglioii and eomiuissure ; hy, liypophysis ; K, cartihii^inous basis cranii ; /, infuntlibnluin :/, lobus posterior ; .V, mesencephalon ; Ml, myelencephalou ; Mt, metencephalon : , plifiicerebelli posterior ; , recessus opticus ; .s, saccus infuudibuli ; t, telencephalon ; (.0, tectumopticum ; , tuberculum posterius ; r, valvula cerebelli posterior ; , velum transversuni. been described in Elasmobranchs, Ainui, and Protopterus: it isthe nervus terminalis, which issues from the fore-brain near theolfactory nerve, bears a ganglion, and supplies the epithelium of thenasal sac (Pinkus [329], Allis [10], Locy [284rt], Johnston [248o]).It may represent the dorsal root
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
