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Organization of the nervous system in cyclostome Crisia eburnea and evolution of the cerebral ganglion in bryozoansтезисы доклада
- Авторы: Temereva E.N., Kosevich I.A.
- Сборник: 18th International Bryozoology Association conference, 16-22 June 2019, The Technical University of Liberec in Czech Republic
- Тезисы
- Год издания: 2019
- Место издания: The Technical University Liberec, Czech Republic
- Первая страница: 110
- Аннотация: Among bryozoans, cyclostome anatomy is the least studied by modern methods. New data on the nervous system make morphological analysis much more fruitful to resolve some questions of bryozoan evolution and phylogeny. The nervous system of cyclostome Crisia eburnea was studied by transmission electron microscopy and confocal laser scanning microscopy. The cerebral ganglion has an upper concavity and a small inner cavity filled with cilia and microvilli, thus exhibiting features of neuroepithelium. The cerebral ganglion is associated to the circumoral nerve ring, the circumpharyngeal nerve ring, and the outer nerve ring. Each tentacle has six longitudinal neurite bundles. The body wall is innervated by thick paired longitudinal nerves. The nervous system of the cyclostome C. eburnea combines phylactolaemate and gymnolaemate features. Innervation of tentacles by six neurite bundles is similar of that in Phylactolaemata. The presence of circumpharyngeal nerve ring and outer nerve ring is characteristic of both, Cyclostomata and Gymnolaemata. The structure of the cerebral ganglion may be regarded as a result of transformation of hypothetical ancestral neuroepithelium. This transformation may be traced within recent bryozoans: the primitive ganglion with large upper concavity and inner cavity in Cyclostomata, the ganglion with large inner cavity filled with cilia and microvilly in Ctenostomata, the ganglion with small inner cavity that lacks cilia and microvilli in Phylactolaemata, and the solid ganglion without inner cavity in most of Gymnolaemata. Primitive cerebral ganglion and combination of nerve plexus and cords in the nervous system of C. eburnea allows to suggest that the nerve system topography of C. eburnea may represent an ancestral state of nervous system organization in Bryozoa. This study is supported by Russian Science Foundation (#18-14-00082).
- Добавил в систему: Темерева Елена Николаевна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | P_110_CerebrGanglCyclost.pdf | 288,6 КБ | 23 июля 2019 [Temereva] |