Chromatophore Motor Units in Eledone Cirrhosa (Cephalopoda: Octopoda)
Chromatophore Motor Units in Eledone Cirrhosa (Cephalopoda: Octopoda)
复制标题
Eledone Cirrhosa 的色素运动单位（头足类：章鱼）
DOI：
--
复制
发表时间：
1985
期刊：
影响因子：
--
通讯作者：
P. Boyle
中科院分区：
文献类型：
--
作者：
F. Dubas;P. Boyle
用抽吸电极刺激皮肤中的神经束，用光电管或摄像机监测色素细胞的运动，研究了章鱼Eledone spectrosa色素细胞肌肉的神经支配。注意力集中在组织的色素细胞肌纤维成运动单位。单个肌肉纤维对单个电脉冲的反应是类似抽搐的收缩，这种收缩不会促进重复，但会在大约10-15 Hz的频率下累积成平滑的强直。在强直频率下，单个色素细胞的扩张程度总是最大的。然而，扩展的色素细胞的数量可以通过刺激电压或频率的变化来分级。单个的色素细胞，可能还有单个的肌纤维，都是几个运动单位的一部分。在由其他运动轴突提供服务的色素细胞中发现了形成给定运动单位的色素细胞。运动单位显然形成了自然模式的精确部分。
Innervation of chromatophore muscles of the octopus Eledone cirrhosa was investigated by stimulating nerve bundles in the skin with a suction electrode and monitoring chromatophore movements with a photo-cell or a video camera. Attention was focused on the organization of the chromatophore muscle fibres into motor units. Individual muscle fibres respond to single electrical impulses with twitch-like contractions that do not facilitate with repetition, but summate to a smooth tetanus at about 10–15 Hz. At tetanic frequency, the degree of expansion of single chromatophores is always maximal. However, the number of expanded chromatophores can be graded by variations of either the stimulus voltage or frequency. Individual chromatophores and probably individual muscle fibres are part of several motor units. Chromatophores forming a given motor unit are found among chromatophores served by other motor axons. The motor units apparently form precise parts of natural patterning.