File:Image from page 322 of "On the anatomy of vertebrates (electronic resource)" (1866) (14732543636).jpg

Identifier: b20416039_001 Title: On the anatomy of vertebrates [electronic resource] Year: 1866 (1860s) Authors: Owen, Richard, 1804-1892 Subjects: Anatomy, Comparative Vertebrates Fishes Reptiles Mammals Birds Publisher: London : Longmans, Green Contributing Library: Wellcome Library Digitizing Sponsor: Wellcome Library

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Text Appearing Before Image: ENCEPHALON OF FISHES. 277

Text Appearing After Image: in Fishes, is called the epencephalon, fig. 179,/, C, fig. 178, g, c ;it is relatively larger, occupies a greater proportion of the cranium,and is more complex and diversified in this than in any of thehigher classes of Yertebrata. The next succeeding primary division of the brain is called thee mesencephalon, figs. 180 & 18J, b, e,f: it is usually the largestdivision in Osseous Fishes, and con-sists of two upper spheroidal bodies, 180called optic lobes,1 figs. 176, 177,180, b (in most of the figures, o),of two lower subspherical bodies,called4 hypoaria,2 figs. 178, 185, n,fig. 181, e, with intervening con-necting walls enclosing a cavity, © < O # J 3 Brain of Perch, upper surface, xxiii. called the (third ventricle, which is prolonged downward into the pedicle of the 6 hypophysis, orpituitary gland, fig. 185, p, and upward into that of the fcona-rium or pineal gland, fig. 175, id. The prepyramidal columnsare continued forwards, along the floor of the fourth ventricle,where th

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