THE PHOTOSENSORY FUNCTION OF THE PINEAL ORGAN OF THE PIKE (ESOX-LUCIUS L) CORRELATION BETWEEN STRUCTURE AND FUNCTION
THE PHOTOSENSORY FUNCTION OF THE PINEAL ORGAN OF THE PIKE (ESOX-LUCIUS L) CORRELATION BETWEEN STRUCTURE AND FUNCTION
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DOI：
10.1007/bf00612806
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发表时间：
1981-01-01
期刊：
影响因子：
--
通讯作者：
MEISSL, H
中科院分区：
文献类型：
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作者：
FALCON, J;MEISSL, H
从暴露的派克松果体器官的电记录（E。lucius L.）进行，以便本地化的感光结构。细胞外记录显示，从松果体束的神经纤维和单个神经元从松果体器官的远端区域的维持活动。在增加水平的稳定暴露于白色光，脉冲频率下降。用380-710 nm之间的波长照射该器官导致抑制尖峰活动（无色反应），与缓慢分级反应（松果体电图）相关。在光适应器官中，灵敏度曲线在530和620 nm处表现出最大值，在暗适应器官中，在530 nm处表现出1个最大值。在罕见的情况下，从单个神经节细胞记录抑制性（λ max 380 nm）和兴奋性（λ max 620 nm）响应（色响应）。一些观察（暗适应曲线;强度-持续时间关系）表明，尖峰电位和分级反应可能不是由相同的结构产生的。慢电位无尖峰电位记录从孤立的内侧区域的松果体，没有神经细胞观察。梭子鱼的松果体似乎是一个功能性的感光器官，可以作为太阳辐射的剂量计，并作为一个指标的一天。其上皮的形态分化与其功能密切相关，没有电活动从内侧区传播到大脑。
Electrical recordings from the exposed pineal organ of the pike (E. lucius L.) were performed in order to localize the photoreceptive structures. Extracellular recordings showed a maintained activity of nerve fibers from the pineal tract and of single neurons from the distal region of the pineal organ. At increasing levels of steady exposure to white light, the impulse frequency decreased. Illumination of the organ with wavelengths between 380-710 nm resulted in an inhibition of the spike activity (achromatic response), associated with slow graded responses (electropinealogram). Sensitivity curves exhibited maxima at 530 and 620 nm in the light adapted, and 1 maximum at 530 nm in the dark adapted organ. In rare occasions, inhibitory (.lambda.max 380 nm) and excitatory (.lambda.max 620 nm) responses were recorded from single ganglion cells (chromatic response). Some observations (dark adaptation curves; intensity-duration relationship) suggest that the spike potentials and graded responses are probably not generated by the same structures. Slow potentials without spike potentials were recorded from isolated medial regions of the pineal where no nerve cells are observed. The pineal organ of the pike appears to be a functional photoreceptive organ that may act as a dosimeter of solar radiation, and as an indicator of day-length. The morphological differentiation of its epithelium is closely related to its function, no electrical activity being propagated from the medial region to the brain.