The whole-body withdrawal response of Lymnaea stagnalis. I. Identification of central motoneurones and muscles.
The whole-body withdrawal response of Lymnaea stagnalis. I. Identification of central motoneurones and muscles.
复制标题
Lymnaea stagnalis 的全身戒断反应。
DOI：
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发表时间：
1991
影响因子：
2.8
通讯作者：
P. Benjamin
中科院分区：
文献类型：
--
作者：
G. P. Ferguson;P. Benjamin
两种肌肉系统介导了 Lymnaea stagnalis 的全身缩回反应：小柱肌 (CM) 和背侧纵肌 (DLM)。 CM 受小柱神经支配，纵向收缩以缩短腹侧头足复合体，并将壳向前和向下拉过身体。 DLM 受颈上神经和颈下神经以及左右顶神经支配。在全身缩回过程中，DLM 与 CM 同步收缩，并纵向缩短背侧头足。 CM 和 DLM 由运动神经元网络支配。这些细胞的体体位于中枢神经系统（CNS）的七个神经节中，但特别集中在大脑神经节的两侧对称的A簇中。 CM 由大脑和足神经节中的细胞支配，DLM 由大脑、足、胸膜和左顶叶神经节中的细胞支配。单个运动神经元支配大而离散的肌肉区域，这些区域通常与其他运动神经元支配的区域重叠。运动神经元动作电位在肌纤维内引起一对一的非促进性兴奋性连接电位。 CM 或 DLM 中没有记录到全有或全无的动作电位，并且它们似乎不受抑制性运动神经元的支配。整个运动神经元网络是电紧张耦合的，中枢神经系统一侧的大多数细胞彼此强耦合，但与中枢神经系统对侧的细胞弱耦合。当动物在全身缩回期间缩回其头足复合体时，运动神经元之间的这种电紧张耦合可能对于产生 CM 和 DLM 的同步收缩很重要。
Two muscle systems mediated the whole-body withdrawal response of Lymnaea stagnalis: the columellar muscle (CM) and the dorsal longitudinal muscle (DLM). The CM was innervated by the columellar nerves and contracted longitudinally to shorten the ventral head-foot complex and to pull the shell forward and down over the body. The DLM was innervated by the superior and inferior cervical nerves and the left and right parietal nerves. During whole-body withdrawal, the DLM contracted synchronously with the CM and shortened the dorsal head-foot longitudinally. The CM and the DLM were innervated by a network of motoneurones. The somata of these cells were located in seven ganglia of the central nervous system (CNS), but were especially concentrated in the bilaterally symmetrical A clusters of the cerebral ganglia. The CM was innervated by cells in the cerebral and pedal ganglia and the DLM by cells in the cerebral, pedal, pleural and left parietal ganglia. Individual motoneurones innervated large, but discrete, areas of muscle, which often overlapped with those innervated by other motoneurones. Motoneuronal action potentials evoked one-for-one non-facilitating excitatory junction potentials within muscle fibres. No all-or-nothing action potentials were recorded in the CM or DLM, and they did not appear to be innervated by inhibitory motoneurones. The whole network of motoneurones was electrotonically coupled, with most cells on one side of the CNS strongly coupled to each other but weakly coupled to cells on the contralateral side of the CNS. This electrotonic coupling between motoneurones is probably important in producing synchronous contraction of the CM and DLM when the animal retracts its head-foot complex during whole-body withdrawal.
软体动物血管、海兔前主动脉的神经控制。
影响因子：
2.5
作者：
Sawada,M;Blankenship,JE;McAdoo,DJ
通讯作者：
McAdoo,DJ