Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 140 COMPARATIVE AN ATOM v. remains in an embryonic condition, and can hardly be said to have a physiological function ; the brain of those Fishes in which this con- dition is retained probably acts mainly as a reflex machine, and there is little doubt that the mental processes ol FIG 113A.—LONGITUDINAL VERTICAL SECTION THROUGH THE ANTERIOR PART OF THE TELEOSTEAN BRAIN. (Founded on a figure of the Trout's brain by Rabl- Riickhard.) 2Vo, roof of the optic lobes ; Tl, torus
Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 140 COMPARATIVE AN ATOM v. remains in an embryonic condition, and can hardly be said to have a physiological function ; the brain of those Fishes in which this con- dition is retained probably acts mainly as a reflex machine, and there is little doubt that the mental processes ol FIG 113A.—LONGITUDINAL VERTICAL SECTION THROUGH THE ANTERIOR PART OF THE TELEOSTEAN BRAIN. (Founded on a figure of the Trout's brain by Rabl- Riickhard.) 2Vo, roof of the optic lobes ; Tl, torus longitiulinalis ; Cp, posterior commissure ; Op, pineal gland, with a cavity (Gfp1) in its interior ; Ep, Ep, the ependyma, which lines the walls of the ventricles ; t, point at which the epithelial roof of the secondary fore-brain (pallium. Pn) becomes continuous with the lining of the anterior wall of the pineal tube: the former is folded inwards at /; J'.cm, common ventricle of the secondary fore-brain ; , third ventricle ; , , olfactory bulb and nerve ; , corpus striatum, which was formerly taken to represent the whole of the prosencephalon, and which lies on either side of the middle line; , optic chiasma ; Ci, inferior commissure (Gadden) ; ''//, liorizontal commissure (Fritsch) : J, infundilmlnm ; If, II1, hypophysis; Sv, siicciis vaseulosus : Li, lobi infcriores ; Aq, aqueduct of Sylvius; tr, trochlear nrrvc ; 1'itl, \':il villa ccrebclli. which take jilacc in the cortical gray substance of the brains of higher Vertebrates do not obtain in them. The mid-brain cerebellum arc by far the largest portions of Ihc brain (Figs. 114 and llo, MIT, ////), while the thalamencepnalon is depressed between Ihe prosencephalon and
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