A treatise on zoology . on the surface, as, for instance, in the Selachian, extends forwardsand inwards into the ventricle of the mesencephalon. In the. Diagrams of transverse sections througli the secondary fore-brain of A, Polypterus (afterBnrekhardt); B, Acijxnser (after Goronowitsch); C, Amia; D, Salmo; E, Protopferus (afterBurckliardt). Chondrostei the solid cerebellum projects but little into themesocoele, and forms but a rudiment of this valvula cerebelli (), which becomes very large in the Teleosts, filling almostcompletely the cavity of the mid-brain (Fig. 352). Large pairedhol
A treatise on zoology . on the surface, as, for instance, in the Selachian, extends forwardsand inwards into the ventricle of the mesencephalon. In the. Diagrams of transverse sections througli the secondary fore-brain of A, Polypterus (afterBnrekhardt); B, Acijxnser (after Goronowitsch); C, Amia; D, Salmo; E, Protopferus (afterBurckliardt). Chondrostei the solid cerebellum projects but little into themesocoele, and forms but a rudiment of this valvula cerebelli (), which becomes very large in the Teleosts, filling almostcompletely the cavity of the mid-brain (Fig. 352). Large pairedhollow optic lobes are conspicuous, except in the Chondrostei, theirroof (tectum opticum) covering the valvula. The diencephalonbecomes shortened and partially hidden above; below there is-a large infundibular outgrowth, with very well developed lobiitiferiores and saccus vasculosus (Figs. 282-3, 353). The fore-brainis remarkably undeveloped ; no cerebral hemispheres are formed,the lamina terminalis becomes almost horizontal, the basal ganglia(corpus striatum and epistriatum) are the only conspicuous pairedthickenings, and the whole of the roof rema
Size: 2103px × 1188px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
