Acetylcholinesterase activity in nerve endings of tails of Rana japonica and R. catesbeiana during metamorphosis |
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Authors: | Dr. F. Sasaki D. Baxter Grillo T. Horiguchi K. Watanabe |
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Affiliation: | (1) Department of Biology, School of Dental Medicine, Tsurumi University, Yokohama, Japan;(2) Department of Biology, School of Dental Medicine, Tsurumi University, 2-1-3 Tsurumi, Tsurumi-ku, 230 Yokohama, Japan;(3) Department of Anatomy and Cell Biology, Faculty of Health Sciences, Ife University, Nigeria;(4) Present address: Department of Biology, Nihon University School of Dentistry at Matsudo, Matsudo, 271 Chiba, Japan |
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Abstract: | Summary In anuran tadpole tails, the myelinated motor nerve fibers branch in the myoseptum to innervate both red and white muscle fibers at, or near, their ends. There are no significant ultrastructural differences between the nerve endings of the two types of muscle fibers.Intense acetylcholinesterase reaction product was observed in synaptic clefts and junctional folds, as well as in transverse tubules. As metamorphosis proceeded, the junctional folds of the nerve endings disappeared, however, acetylcholinesterase reaction product was still observed in the synaptic clefts. As muscle fibers began to degenerate, nerve endings began to separate from them. However, after nerve endings were completely separated from the surfaces, degenerated muscle fibers, synaptic and cored vesicles were still well preserved although no acetylcholinesterase reaction product was found. It seems clear that the mechanism of the muscle degeneration in the tadpole tail during metamorphosis is not the result of the degeneration of its nerve endings. |
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Keywords: | Nerve ending Tadpole tail Ultrastructure Acetylcholinesterase Metamorphosis Rana japonica R. catesbeiana |
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