Hirose Euichi, Mukai Hideo
Shimoda Marine Research Center, University of Tsukuba, Shimoda, Shizwoka 415, Japan.
Department of Biology, Faculty of Education, Gunma University, Maebashi, Gunma 371, Japan.
J Morphol. 1992 Mar;211(3):269-273. doi: 10.1002/jmor.1052110304.
The glomerulocyte is a type of blood cell in the compound ascidian, Polyandrocarpa misakiensis. It is a discoidal cell, measuring 12-13 μm in diameter and about 3 μm in thickness. The outer half of the cell is occupied by concentrically-arranged fibers, usually 0.2-0.3 μm thick; the nucleus and organelles are confined to the central cytoplasm. The ordinary epidermal cells are columnar and are characterized by an apical homogeneous cytoplasmic bulge, vesicular bodies in the cytoplasm, and juctions between them. Growing or immature glomerulocytes are found only in the epidermis. They have intracellular fibers and vesicular bodies, and there are juctions between them and epidermal cells. These facts strongly suggest the origin of the glomerulocyte from an epidermal cell. However, no definite statement can be made as yet because earliest stages of differentiation have not been observed. The glomerulocyte fully differentiated in the epidermis is apparently released into the hemocoel.
肾小球细胞是复合海鞘三崎聚海鞘（Polyandrocarpa misakiensis）中的一种血细胞。它是一种盘状细胞，直径为12 - 13μm，厚度约为3μm。细胞的外半部分被同心排列的纤维占据，纤维通常厚0.2 - 0.3μm；细胞核和细胞器局限于中央细胞质中。普通的表皮细胞呈柱状，其特征是顶端有均匀的细胞质凸起、细胞质中有囊泡体以及它们之间的连接。正在生长或未成熟的肾小球细胞仅存在于表皮中。它们有细胞内纤维和囊泡体，并且它们与表皮细胞之间存在连接。这些事实有力地表明肾小球细胞起源于表皮细胞。然而，由于尚未观察到分化的最早阶段，目前还无法给出明确的结论。在表皮中完全分化的肾小球细胞显然会释放到血腔中。
