Nervous System Development of the Sea Cucumber Stichopus Japonicus.
From: Department of Biology, Keio University, Yokohama 223-8521, Japan. hiroaki.nakano@kmf.gu.se
Developmental biology
- Publish Date: Apr 2006
- ISSN: 0012-1606
- Volume: 292
- Issue: 1
- Pages: 205-12
- Medium: Print
- Language: English
- Citation (JAMA): Nakano Hiroaki, Murabe Naoyuki, Amemiya Shonan, et al. Nervous System Development of the Sea Cucumber Stichopus Japonicus.. Dev. Biol. Apr 2006;292:205-12
Abstract
The nervous system development of the sea cucumber Stichopus japonicus was investigated to explore the development of the bilateral larval nervous system into the pentaradial adult form typical of echinoderms. The first nerve cells were detected in the apical region of epidermis in the late gastrula. In the auricularia larvae, nerve tracts were seen along the ciliary band. There was a pair of bilateral apical ganglia consisted of serotonergic nerve cells lined along the ciliary bands. During the transition to the doliolaria larvae, the nerve tracts rearranged together with the ciliary bands, but they were not segmented and remained continuous. The doliolaria larvae possessed nerves along the ciliary rings but strongly retained the features of auricularia larvae nerve pattern. The adult nervous system began to develop inside the doliolaria larvae before the larval nervous system disappears. None of the larval nervous system was observed to be incorporated into the adult nervous system with immunohistochemistry. Since S. japonicus are known to possess an ancestral mode of development for echinoderms, these results suggest that the larval nervous system and the adult nervous system were probably formed independently in the last common ancestor of echinoderms.
Mesh Headings (Keywords): Animals, Cell Differentiation, Cell Proliferation, Immunohistochemistry, Larva, Nervous System, Neurons, Stichopus
Check for Full Text / PubMed Unique Identifier (PMID): 16442090
This abstract is part of PubMed, a service of the U.S. National Library of Medicine. PubMed includes more than 17 million citations from MEDLINE and other life science journals for biomedical articles. See Copyright and Disclaimers.
Linked medical terms appearing on this page are added by Healia to help readers find more information and are not part of the original PubMed document.
The data herein was last updated on July 8th, 2008 and may not reflect the most current and accurate data available from NLM.