Biol. Bull. Sign up for etocs!
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Page, L. R.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Page, L. R.

The Biological Bulletin, Vol 182, Issue 3 366-381, Copyright © 1992 by Marine Biological Laboratory

NEUROBIOLOGY AND BEHAVIOR

New Interpretation of a Nudibranch Central Nervous System Based on Ultrastructural Analysis of Neurodevelopment in Melibe leonina. II. Pedal, Pleural, and Labial Ganglia

L. R. Page
Department of Biology, University of Victoria, Victoria, British Columbia, Canada V8W 2Y2

Electron microscopical analysis of semi-serial sections through larval stages of the dendronotid nudi-branch Melibe leonina (Gould, 1852) revealed paired placodes of neurogenic ectoderm at the base of the foot. The location of these laterocephalic placodes corresponds to descriptions of the ectodermal site generating pleural neurons in prosobranchs. In Melibe, there are two sites of neuronal ingression within each laterocephalic placode. Neurons ingressing from one of these sites join the cerebral ganglia, and their initial axons extend into the cerebrobuccal connectives or run distally along the esophagus. I identify these neurons as homologues of labial ganglia neurons in archeogastropods. However, neurons derived from the second ingression site within each laterocephalic placode join the pedal ganglia. Pedal ganglia are present in hatching veligers and are linked to the cerebral ganglia by cerebropedal connectives associated with the statocyst nerves. A second connective between each cerebral and pedal ganglia appears at the onset of neuronal ingression from the laterocephalic placodes. Peripheral axons branching from this second pair of connectives are associated with laterocephalic neurons that ingress to the pedal ganglia. I argue that these are pleural neurons, meaning that the pleural ganglia in Melibe are uncoupled from the visceral loop.


This article has been cited by other articles:


Home page
 Biol. Bull.Home page
R. P. Croll
Development of Embryonic and Larval Cells Containing Serotonin, Catecholamines, and FMRFamide-Related Peptides in the Gastropod Mollusc Phestilla sibogae
Biol. Bull., December 1, 2006; 211(3): 232 - 247.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1992 by the Marine Biological Laboratory.