Table of Contents
International Scholarly Research Notices
Volume 2014 (2014), Article ID 196594, 8 pages
Research Article

Development of the Early Axon Scaffold in the Rostral Brain of the Small Spotted Cat Shark (Scyliorhinus canicula) Embryo

1Institute of Biomedical and Biomolecular Science, University of Portsmouth, PO1 2DY Portsmouth, UK
2Institut de Génétique et Développement, CNRS, UMR6290, Faculté de Médecine, Université de Rennes 1, 35000 Rennes, France
3Institute of Marine Sciences, School of Biological Sciences, University of Portsmouth, P04 9LY Portsmouth, UK

Received 2 July 2014; Revised 15 September 2014; Accepted 16 September 2014; Published 29 October 2014

Academic Editor: Guillermo Estivill Torrús

Copyright © 2014 Michelle Ware et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The cat shark is increasingly used as a model for Chondrichthyes, an evolutionarily important sister group of the bony vertebrates that include teleosts and tetrapods. In the bony vertebrates, the first axon tracts form a highly conserved early axon scaffold. The corresponding structure has not been well characterised in cat shark and will prove a useful model for comparative studies. Using pan-neural markers, the early axon scaffold of the cat shark, Scyliorhinus canicula, was analysed. Like in other vertebrates, the medial longitudinal fascicle was the first axon tract to form from a small cluster of neurones in the ventral brain. Subsequently, additional neuronal clusters and axon tracts emerged which formed an array of longitudinal, transversal, and commissural axons tracts in the Scyliorhinus canicula embryonic brain. The first structures to appear after the medial longitudinal fascicle were the tract of the postoptic commissure, the dorsoventral diencephalic tract, and the descending tract of the mesencephalic nucleus of the trigeminal nerve. These results confirm that the early axon scaffold in the embryonic brain is highly conserved through vertebrate evolution.