. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. NERVES OF FISHES. 301 muscles of tlie eyeball cannot be separated from tlie fifth pair. In all other fishes the sixth or abduce?it nerve, fig. 185, g, has its proper origin, as well as the fovirth and third. The third, or oculomo- torius, ib. 3, rises from the base of the mesencephalon, behind the hypoaria, ib. n, or from the commissura ansulata; it escapes through the orbito-sphenoid (Carp), or the unossified membrane beneath it (Cod, fig. 196, 3), and is distributed constantly to the recti superior, inferior, and inter
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. NERVES OF FISHES. 301 muscles of tlie eyeball cannot be separated from tlie fifth pair. In all other fishes the sixth or abduce?it nerve, fig. 185, g, has its proper origin, as well as the fovirth and third. The third, or oculomo- torius, ib. 3, rises from the base of the mesencephalon, behind the hypoaria, ib. n, or from the commissura ansulata; it escapes through the orbito-sphenoid (Carp), or the unossified membrane beneath it (Cod, fig. 196, 3), and is distributed constantly to the recti superior, inferior, and internus, and to the inferior; it also sends filaments into the eyeball: the ciliary stem, or a branch of it, usually unites with a branch of the fifth nerve, and sometimes, as in the Mackerel, Gar-pike, and Lump-fish, developes a small ciliary ganglion at the point of communication. The fourth nerve, or trocldearis, fig. 196, 4, rises from the back of the base of the optic lobes, between these and the cerebellum ; 201. Brain anil origins of tlic llftii norvcs of tlio Cod. CCVIII. it escapes either through the orbito-sphenoid (Carp), or the con- tiguous membrane (Cod), and is constantly and exclusively dis- tributed to the superior oblique eye-muscle, ib. g. The sixth, or abducent, nerve, figs. 185, 196, 6, rises from the prepyramidal tracts of the medulla oblongata, fig. 185, a, beneath the fifth, and, in most Osseous Fishes, by two roots, as in the Cod, ib. 6. It usually closely adheres to the ganglionic origin of the fifth. In the Carp and Lump-fish it receives a filament from the sympathetic, before its final distribution to the rectus externus,. 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 Owen, Richard, 1804-1892; Cornell University. College of Veterinary Medicine. Flower-Sprecher Veterinary Li
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