STRUCTURE, ULTRASTRUCTURE, AND FUNCTION OF THE PREORAL HEART KIDNEY IN SACCOGLOSSUS-KOWALEVSKII (HEMICHORDATA, ENTEROPNEUSTA) INCLUDING NEW DATA ON THE STOMOCHORD
STRUCTURE, ULTRASTRUCTURE, AND FUNCTION OF THE PREORAL HEART KIDNEY IN SACCOGLOSSUS-KOWALEVSKII (HEMICHORDATA, ENTEROPNEUSTA) INCLUDING NEW DATA ON THE STOMOCHORD
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DOI：
10.1111/j.1463-6395.1990.tb01082.x
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发表时间：
1990-12-01
期刊：
影响因子：
1.2
通讯作者：
RUPPERT, EE
中科院分区：
文献类型：
--
作者：
BALSER, EJ;RUPPERT, EE
Kowalevskii心肾位于口前鼻腔(原腔体)内，由口索、心包、心窦和肾小球组成。口索是肠道的一种憩室，以空泡状上皮细胞为特征，周围环绕着基膜和结缔组织。心包是一种肌上皮，位于中央心窦的背侧。进入原腔并通过鼻孔与外界相连的是原腔导管，其部分由多纤毛的吸收上皮细胞组成。用活性染料对背部主干血管进行灌流，可见血液迅速流入肾小球血管。对肾小球足细胞下的细胞外基质的通透性特征的检查揭示了右旋糖苷铁(摩尔。5000道尔顿)从中央心窦进入原腔。肾小球细胞和原腔衬里细胞摄取葡聚糖铁。这些结果表明，血管液体被肾小球过滤，在原腔内产生初级尿液，当它通过腹膜、穿过原腔导管和流出鼻孔时，可能会发生改变。提供了有关口针形态的新数据。讨论了半脊索口索和脊索脊索之间有争议的同源性。
The heart-kidney of Saccoglossus kowalevskii, which is situated within the anterior preoral proboscis coelom (protocoel), consists of the stomochord, pericardium, heart sinus, and glomerulus. The stomochord, a diverticulum of the gut, is characterized by vacuolated epithelial cells surrounded by basal lamina and connective tissue. The pericardium, a myoepithelium, lies dorsal to the central heart sinus. Opening into the protocoel and connecting with the outside via the proboscis pore is the protocoel duct, which is, in part, composed of multiciliated absorptive epithelial cells. Perfusion of the dorsal trunk vessel with vital dyes reveals a rapid flow of blood into the glomerular blood vessels. Examination of the permeability characteristics of the extracellular matrix underlying the glomerular podocytes reveals the movement of iron dextran (mol. wt 5000 daltons) from the central heart sinus into the protocoel. Iron dextran uptake by glomerular cells and protocoel lining cells is demonstrated. These results suggest that vascular fluid is filtered by the glomerulus, producing a primary urine in the protocoel which may be modified as it passes over the peritoneum, through the protocoel duct, and out of the proboscis pore. New data concerning the morphology of the stomochord are presented. The controversial homology between the hemichordate stomochord and the chordate notochord is addressed.