Neuronal organization of the ascidian (Urochordata) branchial basket revealed by cholinesterase activity |
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Authors: | S. A. Arkett Dr. G. O. Mackie C. L. Singla |
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Affiliation: | (1) Department of Biology, University of Victoria, V8W2Y2 Victoria, British Columbia, Canada;(2) Present address: Department of Physiology, The Medical School, University of Bristol, BS8 1TD Bristol, England |
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Abstract: | Summary Innervation of the ascidian branchial basket and other structures is demonstrated by staining for cholinesterase. Cholinesterase activity is not restricted to synaptic sites but is present throughout the neurons. Primary and secondary axonal bundles form a bilaterally symmetric innervation pattern around the large dorsal visceral nerve. These bundles continue to split into progressively smaller bundles as they course throughout the basket. Axons are suspended in a fibrous matrix and run within the blood sinuses on the atrial side of the basket. Stigmatal ciliated cells of the branchial basket are innervated by highly branched distal portions of neurons, whose cell bodies are located in the ganglion. Synaptic boutons, containing electron-lucent vesicles, are found at nearly all stigmatal ciliated cells. NiCl2backfills of the visceral nerve reveal a distinct population of central neurons, some of which presumably control ciliary arrest. |
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Keywords: | Acetylcholinesterase Cilia Cholinergic nerves, terminals Synapses Neuro-ciliary control Chelyosoma productum, Corella eumyota, Corella willmeriana (Tunicata, Ascidiacea) |
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