Microscopic and submicroscopic structure of the synapsis in the ventral ganglion of the acoustic nerve |
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| Authors: | ESTABLE C REISSIG M DE ROBERTIS E |
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| Affiliation: | 1. Division of Hematology, Jichi Medical University Saitama Medical Center, Saitama, Japan;2. Department of Hematology and Oncology, Tokai University School of Medicine, Kanagawa, Japan;3. Department of Hematology, Oita Prefectural Hospital, Oita, Japan;4. Department of General Medicine and Infectious Diseases, National Cancer Center Hospital East, Chiba, Japan;5. Department of Hematopoietic Stem Cell Transplantation, National Cancer Center Hospital, Tokyo, Japan;6. Department of Hematology, Tokyo Women''s Medical University, Tokyo, Japan;7. Department of Hematology, Federation of National Public Service Personnel Mutual Aid Associations Toranomon Hospital, Tokyo, Japan;8. Hematology Division, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, Tokyo, Japan;9. Department of Hematology, Japanese Red Cross Nagoya First Hospital, Aichi, Japan;10. Department of Hematology, Kanagawa Cancer Center, Kanagawa, Japan;11. Department of Hematology, Hamanomachi Hospital, Fukuoka, Japan;12. Department of Hematology, Hiroshima Red Cross Hospital & Atomic-bomb Survivors Hospital, Hiroshima, Japan;13. Department of Hematology and Oncology, Anjo Kosei Hospital, Aichi, Japan;14. Department of Hematology, Hyogo College of Medicine Hospital, Hyogo, Japan;15. Department of Hematology, National Hospital Organization Kumamoto Medical Center, Kumamoto, Japan;16. Division of Hematology, Jichi Medical University, Tochigi, Japan;17. Hematology, Graduate School of Medicine, Osaka City University, Osaka, Japan;18. Department of Hematology, Hokkaido University Hospital, Hokkaido, Japan;19. Preparation Department, Japanese Red Cross Kinki Block Blood Center, Osaka, Japan;20. Department of Hematology and Oncology, Miyagi Children''s Hospital, Miyagi, Japan;21. Japanese Data Center for Hematopoietic Cell Transplantation, Aichi, Japan;22. Department of Registry Science for Transplant and Cellular Therapy, Aichi Medical University School of Medicine, Aichi, Japan;23. Transplant Complications Working Group of the Japan Society for Transplantation and Cellular Therapy (JSTCT) |
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| Abstract: | The ventral ganglion of the acoustic nerve was selected for a microscopic and submicroscopic study of the interneuronal synapsis.In this work the electron microscope observations made on ultrathin sections of osmic acid fixed material were compared with silver-stained thick (30 μ) and thin sections (0.5 to 1 μ) of the same material. The microscopic observations show a wide variety of synaptic terminals including end-feet, club-endings and Held's bulbs surrounding almost completely the body of the cell and dendrites.The electron microscope observation shows typical club-like endings and end-feet in intimate contact with the cell surface. At the level of the synaptic junction the pre- and postsynaptic protoplasm are separated by a membrane of high electron density which is a continuation of the sheath which surrounds the terminal. This sheath has the same appearance and electron density as the myelin sheath of the nerve fibers. At the synaptic junction the membrane varies in thickness between 2000 and 320 Å. Some of the thinner membranes have a double lamellar appearance.The presynaptic protoplasm has a very low electron density and shows a few protofibrils and ovoidal granules of mitochondrial aspect. In some cases there are indications of an axon membrane about 100 Å thick.The postsynaptic protoplasm is more compact and of higher electron density. Mitochondria and smaller granules are observed in the neighborhood of the synapsis. |
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