. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. THE BRAIN 161 The cerebellum is always very large, overlapping the optic lobes and the medulla oblongata to a greater or less extent: it is divided up into several folds lying one behind the other, and usually con- tains a metaccele opening into the fourth ventricle (Figs. 130 and 131). In Sharks the medulla oblongata is an elongated cylindrical body, while in Kays it is more compressed and triangular; at its. Fio. 131. — Bbain of Cheilo- scylHum. (From Parker and Haswell's Zoology.) Viewed from the dorsal side, the ro
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. THE BRAIN 161 The cerebellum is always very large, overlapping the optic lobes and the medulla oblongata to a greater or less extent: it is divided up into several folds lying one behind the other, and usually con- tains a metaccele opening into the fourth ventricle (Figs. 130 and 131). In Sharks the medulla oblongata is an elongated cylindrical body, while in Kays it is more compressed and triangular; at its. Fio. 131. — Bbain of Cheilo- scylHum. (From Parker and Haswell's Zoology.) Viewed from the dorsal side, the roof of the various ven- tricles removed so as to show the relations of the cavities (semi-diagrammatic). cer, dilatation from which the metaccele is given oflf; dia, thalamoccele—the reference line points to the opening leading into the infundibu- lum ; iter, aqueduct of Sylvius (mesoccele), into which the optocceles (opt) open; meta, myeloccele ; para, lateral ven- tricle ; pros, median part of prosoccele ; 7-h, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wiedersheim, Robert, 1848-1923; Parker, William Newton, 1857-1923. London, Macmillan
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