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首页> 外文期刊>Journal of Neurophysiology >Electrophysiological responses to light of neurons in the eye and statocyst of Lymnaea stagnalis.
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Electrophysiological responses to light of neurons in the eye and statocyst of Lymnaea stagnalis.

机译：眼球和胸腺静囊中神经元光的电生理反应。

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Lymnaea can be classically conditioned by pairing photic stimulation with a rotational stimulus. The electrophysiological properties of the Lymnaea photoreceptors and statocyst neurons are incompletely known. There are 2 types of ocular photoreceptors and 3 types of statocyst "hair cells." Type A photoreceptors had a response latency from 200 to 400 ms, with a graded depolarizing response having maximum action spectra at 480-500 nm, corresponding to the beta(max) of rhodopsin. Additionally they extend their axons in the direction of the other type of photoreceptor neuron, the type T cell. These neurons have a 2-component response to light: a response reversibly reduced in Ca(2+)-free saline, and a component persisting in Ca(2+)-free saline. Type T cells send processes into the cerebral ganglion and terminate close to the ending of the statocyst hair cells. Hair cells send their terminal branches to the cerebral ganglia close to the terminations of the type T cells. Caudal hair cells respond to a light flash with a depolarization, whereas the rostral cells respond with a hyperpolarization. The response latency in all hair cells was dependent on the stimulus intensity; the brightest light tested had a latency of 200 ms. The photo-induced response was abolished in Ca(2+)-free saline, whereas it was still present in high Ca(2+)-high Mg(2+) saline, consistent with the hypothesis that the connection between the photoreceptors and hair cells is monosynaptic. Thus the sensory information necessary for forming an association between photic and rotational stimuli converges on the statocyst neurons.
机译：可以通过将光刺激与旋转刺激配对来经典地调节Lymnaea。 lymnaea感光器和statcyst神经元的电生理特性是不完全已知的。有2种类型的眼部光感受器和3种类型的囊状“毛细胞”。 A型感光体的响应潜伏期为200到400毫秒，分级的去极化响应在480-500 nm处具有最大的作用光谱，对应于视紫红质的beta（max）。另外，它们将轴突沿另一种类型的感光神经元T型细胞的方向延伸。这些神经元对光有2个分量的响应：在无Ca（2+）的盐水中可逆地减少的响应，和在无Ca（2+）的盐水中持续存在的一个组件。 T型细胞将过程发送至脑神经节，并在接近囊状囊毛细胞的末端终止。毛细胞将其末端分支发送到靠近T型细胞末端的脑神经节。尾毛细胞对闪光产生反极化作用，而鼻部细胞对超极化反应。所有毛细胞的反应潜伏期均取决于刺激强度。测试的最亮的光具有200 ms的延迟。光诱导的反应在无Ca（2+）的生理盐水中被废除，而在高Ca（2 +）-高Mg（2+）的生理盐水中仍然存在，这与光感受器和头发之间的联系这一假设相一致细胞是单突触的。因此，在光囊和神经刺激之间形成光合和旋转刺激之间的联系所必需的感觉信息会聚。

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