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International Journal of Morphology

On-line version ISSN 0717-9502

Abstract

MONTES DOMINGUEZ, Héctor Marcos; LOPEZ BARCENAS, Raquel  and  GONZALEZ ISAIS, Mónica. Morphological Study of the Brain and Cranial Nerves of Diplobatis ommata (Elasmobranchii: Narcinidae). Int. J. Morphol. [online]. 2014, vol.32, n.4, pp.1152-1155. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022014000400005.

The Torpediniformes group is one of the ancestral batoid lines, the evolution of which has followed a line separated from the rest of this group. No studies have been conducted on the brain morphology of Diplobatis ommata. This is why the objective of this work is describing the anatomy of the brain and the cranial nerves of this species. Organisms were collected in Zihuatanejo, Guerrero, Mexico. The brain was obtained through conventional dissection techniques. The brain of Diplobatis ommata is similar to that of basal sharks; however, it has the electric vesicle typical in Torpediniformes. The largest encephalic structures are the olfactory bulbs and medulla oblongata. The telencephalon is reduced, while the cerebellum has bilateral symmetry and is almost smooth. Disposition of cranial nerves are similar to other batoid groups; but innervation of pairs VII, IX and X is modified: they innervate regions conventionally described, but also electric organs.

Keywords : Elasmobranchii; Torpediniformes; Diplobatis; Brain; Cranial nerves.

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