The morphology and physiological properties of nereid giant fibres |
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| Affiliation: | 1. School of Zoology, George S. Wise Faculty of Life Sciences, Tel-Aviv University, 6997801 Tel-Aviv, Israel;2. The Interuniversity Institute for Marine Sciences in Eilat, 8810302 Eilat, Israel;3. Department of Biology, University of Padova 35121, Padova, Italy;4. The Steinhardt Museum of Natural History, Israel National Center for Biodiversity Studies, Tel-Aviv University, 6997801 Tel-Aviv, Israel;1. Eugene Bell Center for Regenerative Biology and Tissue Engineering, Marine Biological Laboratory, Woods Hole, MA, USA;2. Department of Biology, University of Maryland, College Park, MD, USA;1. Marine Biological Laboratory, Woods Hole, MA, United States;2. University of Maryland, College Park, MD, United States;1. Department of Neuroscience, Spinal Cord and Brain Injury Research Center, Ambystoma Genetic Stock Center, University of Kentucky, Lexington, KY 40536, United States;2. Department of Mathematics, University of Kentucky, Lexington, KY 40506, United States;3. Department of Biology, Northeastern University, Boston, MA 02115, United States |
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| Abstract: | - 1.1. The three sets of giant fibres in the nerve cord of Nereis virens are connected by both electrotonic and chemically transmitting junctions.
- 2.2. The paired laterals and paramedials are connected to their partners by electronic junctions. The laterals are also electrically coupled to the median giant fibre.
- 3.3. The laterals are connected to the paramedials by an excitatory chemical synapse, while in the anterior segments the paramedials provide an inhibitory input to the median giant fibre.
- 4.4. Afferent input to the giant fibres through the segmental nerves two and four is excitatory, except that to the median fibre in the caudal segments.
- 5.5. There is no evidence of the segmental origin of the lateral giant fibres, either in the form of macrosynapses or segmental cell bodies.
- 6.6. The median giant fibre originates from two groups of cell bodies in the sub-oesophageal ganglia.
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