Evolution of cerebral vesicles and their sensory organs in an ascidian larva
Evolution of cerebral vesicles and their sensory organs in an ascidian larva
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海鞘幼虫脑泡及其感觉器官的进化
DOI：
10.1046/j.1463-6395.2000.00054.x
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发表时间：
2001
期刊：
影响因子：
1.2
通讯作者：
P. Burighel
中科院分区：
文献类型：
--
作者：
M. Sorrentino;L. Manni;N. Lane;P. Burighel
索伦蒂诺·M.，曼尼·L泳道N。J.和Burighel P.，2000年。海鞘幼体脑泡及其感觉器官的演化。- 《动物学学报》（斯德哥尔摩）81：243-258
海鞘幼虫的神经系统由脑（包括内脏神经节和感觉囊泡）和与之相连的尾神经索组成。在大多数物种中，两个器官，一个平衡囊和一个具有纤毛光感受器的单眼，包含在感觉囊泡中。第三个假定的感觉器官有时被发现在一个“辅助”神经节囊泡。对施氏葡萄球菌感觉囊泡和辅助神经节囊泡及其相关器官的发育和形态进行了研究。感觉囊泡包含一个独特的器官，光石，对重力和光都有反应。它由一个单细胞平衡囊组成，呈扩张的色素杯状，接受六个感光细胞的延伸。假定的机械感受器细胞（S1细胞），发送纤毛和微绒毛突起接触色素杯。第二组独特的细胞（S2），稍微背侧的S1细胞，具有特征性的微绒毛延伸，类似感光细胞。我们同意这样的观点，即光石是新的，来自原始平衡囊，S2细胞是原始单眼的残余。在神经节囊泡中，一些细胞含有修饰的纤毛和微绒毛延伸，类似于光石的感光体末端。我们的研究结果进行了讨论，根据两种可能的方案有关的神经系统的进化的原索动物。
Sorrentino M., Manni L., Lane N. J. and Burighel P. 2000. Evolution of cerebral vesicles and their sensory organs in an ascidian larva. —Acta Zoologica (Stockholm) 81: 243–258
The ascidian larval nervous system consists of the brain (comprising the visceral ganglion and the sensory vesicle), and, continuous with it, a caudal nerve cord. In most species two organs, a statocyst and an ocellus with ciliary photoreceptors, are contained in the sensory vesicle. A third presumptive sensory organ was sometimes found in an ‘auxiliary’ ganglionic vesicle. The development and morphology of the sensory and auxiliary ganglionic vesicles in Botryllus schlosseri and their associated organs was studied. The sensory vesicle contains a unique organ, the photolith, responding to both gravity and light. It consists of a unicellular statocyst, in the form of an expanded pigment cup receiving six photoreceptor cell extensions. Presumptive mechano-receptor cells (S1 cells), send ciliary and microvillar protrusions to contact the pigment cup. A second group of distinctive cells (S2), slightly dorsal to the S1 cells, have characteristic microvillar extensions, resembling photoreceptor. We concur with the idea that the photolith is new and derived from a primitive statocyst and the S2 cells are the remnant of a primitive ocellus. In the ganglionic vesicle some cells contain modified cilia and microvillar extensions, which resemble the photoreceptor endings of the photolith. Our results are discussed in the light of two possible scenarios regarding the evolution of the nervous system of protochordates.
影响因子：
4.6
作者：
Z. Kozmík;N. Holland;A. Kalousová;J. Pačes;M. Schubert;L. Holland
通讯作者：
Z. Kozmík;N. Holland;A. Kalousová;J. Pačes;M. Schubert;L. Holland
鼠自然杀伤细胞-YAC肿瘤细胞缀合物的可激活酯酶活性。
影响因子：
4
作者：
Petty,HR;Hermann,W;Dereski,W;Frey,T;McConnell,HM
通讯作者：
McConnell,HM