THE CILIATED BRAIN DUCT OF OIKOPLEURA-DIOICA (TUNICATA, APPENDICULARIA)
THE CILIATED BRAIN DUCT OF OIKOPLEURA-DIOICA (TUNICATA, APPENDICULARIA)
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DOI：
10.1111/j.1463-6395.1982.tb00765.x
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发表时间：
1982-01-01
期刊：
影响因子：
1.2
通讯作者：
HOLMBERG, K
中科院分区：
文献类型：
--
作者：
HOLMBERG, K
透射电子显微镜显示导管背侧部分的不同形态，表明不同活动阶段的发生。在一些动物中，尖端腔含有无定形物质，在活动的另一个阶段，该物质通过尖端壁的间隙释放到周围的血细胞中。过渡区将背侧尖端与导管的大腹侧部分分开，其中靠近过渡区的壁由通过紧密连接连接的单层薄细胞组成。在腹侧，大纤毛细胞位于颊腔开口附近的两层。它们具有大量紧密排列的纤毛，这些纤毛在活体动物体内剧烈跳动。该部分的组织类似于原肾病。建议这部分导管具有排泄功能。
Transmission electron microscopy revealed varying morphology of the dorsal part of the duct indicating the occurrence of different stages of activity. In some animals the tip cavity contains an amorphous substance which, at another phase of activity, is released into the surrounding hemocel through interstices in the walls of the tip. A transitional zone separates the dorsal tip from the large ventral part of the duct, where the wall, near the transitional zone, consists of a single layer of thin cells joined by tight junctions. Ventrally, the large ciliated cells lie in 2 levels near the opening into the buccal cavity. They bear numerous, tightly packed cilia which beat vigorously in living animals. The organization of this part resembles that of protonephridia. An excretory function is suggested for this part of the duct.