Cirri of the stalked crinoid Metacrinus rotundus: neural elements and the effect of cholinergic agonists on mechanical properties
Cirri of the stalked crinoid Metacrinus rotundus: neural elements and the effect of cholinergic agonists on mechanical properties
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有柄海百合 Metacrinus rotundus 的 Cirri：神经元件和胆碱能激动剂对机械性能的影响
DOI：
10.1098/rspb.2000.0959
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
T. Motokawa
中科院分区：
文献类型：
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作者：
R. Birenheide;Koji Yokoyama;T. Motokawa
海百合是一种神秘的动物，因为它们的稀缺性，它们的生物学相对被忽视。沿着沿着海百合茎的五个螺旋排列的纤毛，锚和支持动物。它们由通过胶原韧带和中央管相互连接的听小骨组成。Cirri有发达的神经系统，但缺乏肌肉细胞。进行了光镜和电子显微镜研究，以澄清的形态学的神经系统的cirri。发现了两种细胞网络，一种是神经元样细胞，另一种是充满子弹状细胞器的细胞。这两个网络分支整个卷须小骨到间韧带。进行力学测试以分析胆碱能激动剂对这些韧带的力学性能的影响。在测试中，在应用乙酰胆碱、毒蕈碱激动剂和烟碱激动剂后，脊髓韧带软化。对毒蕈碱激动剂的反应时间比乙酰胆碱和烟碱激动剂慢得多。在低浓度下，毒蕈碱激动剂引起力的积极发展。麻醉的纤毛对刺激无反应。这些数据清楚地建立了捕获结缔组织的存在，其可以在通过具有胆碱能受体的神经介导的神经控制下改变其机械特性。观察到的生产力的可能来源进行了讨论，并得出结论，主动收缩的胶原韧带引起运动的纤毛。
Sea lilies are enigmatic animals due to their scarcity and their biology is comparatively neglected. Cirri, arranged in whorls of five along the sea lily stalk, anchor and support the animal. They consist of ossicles interconnected by collagenous ligaments and by a central canal. Cirri have a welldeveloped nervous system but lack muscular cells. A light and electron microscopic study was performed to clarify the morphology of the nervous system of the cirri. Two cellular networks were found, one of neuron‐like cells and one of cells filled with bullet‐shaped organelles. Both networks ramify throughout the cirral ossicles up to the interossicle ligaments. Mechanical tests were performed to analyse the influence of cholinergic agonists on the mechanical properties of these ligaments. In the tests, the cirral ligaments softened after the application of acetylcholine, muscarinic agonists and nicotinic agonists. The reaction time to muscarinic agonists was much slower than to acetylcholine and nicotinic agonists. At low concentrations, muscarinic agonists caused active development of force. No reaction to stimuli was observed in anaesthetized cirri. The data clearly establish the existence of catch connective tissue which can change its mechanical properties under nervous control mediated via nerves with cholinergic receptors. The possible sources of the observed force production are discussed and it is concluded that active contraction of collagenous ligaments causes movement of cirri.
R.Hirota 等人：“物理和生物系统中非线性动力学的未来方向”（Plenum Press），（1993）
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