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Phoronida. In: Structure and Evolution of Invertebrate nervous Systems (Eds.: A. Schmidt-Rhaesa, S. Harzsch, G. Purschke)книга
- Автор: Temereva E.N.
- Год издания: 2015
- Место издания: Oxford University Press UK London, UK
- Объём: 2,0 печатных листов
- Монография
- Аннотация: Phorinds are marine invertebrates with biphasic life cycles. Development of the nervous system starts at stage of late gastrula on the animal pole of embryo, which acquires several 5HT-like immunoreactive (-lir) cells in the epidermis of the apical plate. With time, the apical organ – a larval brain – is formed here. It consists of numerous 5HT-lir and FMRF-lir perikarya, which then give rise to the postoral neurite bundle. The development and organization of the nervous system in phoronid larvae has more in common with the deuterostomian than with the protostomian nervous system. During metamorphosis the apical organ is consumed by juvenile, whereas the postoral neurite bundle retains and gives rise to the definitive tentacular nerve ring. Juvenile inherits from larva the complex structure of the lophophore nervous system: the regular alternation of the intertentacular and abfrontal neurite bundles. In adult phoronids, the nervous system is represented by the intraepithelial nerve plexus, which is thickened in several areas and forms here the dorsal ganglion and tentacular nerve. All phoronids have two (right and left) or one (only left) giant nerve fibers, which start from the dorsal ganglion and pass along left and right sides of the trunk. Each tentacle is innervated by six longitudinal neurite bundles connected the tentacular nerve ring. All nerve elements have a similar cytological organization and stratified structure that is related to the cellular layers. Simplification of definitive nervous system in comparison with complex larval nervous system may correlate with a sessile life style of adult phoronids.
- Добавил в систему: Темерева Елена Николаевна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | 2015_Temereva-NervousBook-Small.pdf | 1,5 МБ | 7 августа 2016 [Temereva] |