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Organization of the axial complex and ultrastructural evidence of its excretory function in the starfishes (Echinodermata, Asteroidea)тезисы доклада Тезисы
- Авторы: Egorova E.A., Ezhova O.V., Malakhov V.V.
- Сборник: 9th European Conference on Echinoderms, 17-19 September 2016
- Тезисы
- Год издания: 2016
- Место издания: Institute of Oceanology, Polish Academy of Sciences, Sopot
- Первая страница: 73
- Аннотация: The axial complex is one of the most typical features of echinoderms. However, there are many mismatching descriptions of its structure in different sources. The homology of the entire complex and its constituent parts within the Echinodermata or with other organs of Deuterostomia remains problematic. The organization of the axial complex in two common species of sea stars – Asterias rubens Linneus, 1758 and Asterias amurensis Lütken, 1871 – was restudied with the help of histological, ultrastructural and modern 3D-reconsruction techniques. The axial complex is located in the wall of the interradius CD and elongated in the oral-aboral direction; it consists of the coelomic organs and the haemal (blood) structures that are morphologically and functionally integral. The axial organ divides into the axial (oral) part and the pericardial (aboral) part, which includes vesicular heart. In its aboral region, the axial organ is connected with the genital haemal ring and one of the five gonad blood lacunae (that is in the interradius CD), along with the so called "gastric haemal tufts" (mesenterial swellings with haemal lacunae inside). The coelothelia of the axial part of the axial ogran contains podocytes and myoepithelial cells, whereas the coelothelia of its pericardial part lacks podocytes. The podocytes can be also found in the coelothelia of the gastric haemal tufts. The possible functions of the axial complex are the blood circulation and the excretion. The blood circulates through the axial ogran mostly in oral direction. We suppose that the axial organ provides the ultrafiltration of the fluid from the blood lacunae through the basal lamina to the axial coelom, and from there the urine is removed through the madreporite.
- Добавил в систему: Егорова Екатерина Алексеевна