鲎腹侧光感受器的不同叶。I. 通过去除神经胶质细胞揭示的叶的功能和解剖学特性。
Distinct lobes of Limulus ventral photoreceptors. I. Functional and anatomical properties of lobes revealed by removal of glial cells.
作者信息
Stern J, Chinn K, Bacigalupo J, Lisman J
出版信息
J Gen Physiol. 1982 Dec;80(6):825-37. doi: 10.1085/jgp.80.6.825.
Abstract
Removing the glial cells that encase Limulus ventral photoreceptors allows direct observation of the cell surface. Light microscopy of denuded photoreceptors reveals a subdivision of the cell body into lobes. Often one lobe, but sometimes several, is relatively clear and translucent (the R lobes). The lobe adjacent to the axon (the A lobe) has a textured appearance. Scanning electron microscopy shows that microvilli cover the surface of R lobes and are absent from the surface of A lobes. When a dim spot of light is incident on the R lobe, the probability of evoking a single photon response is two to three orders of magnitude higher than when the same spot is incident on the A lobe. We conclude that the sensitivity of the cell to light is principally a function of the R lobe.
摘要
去除包裹鲎腹侧光感受器的神经胶质细胞后，可直接观察细胞表面。对裸露的光感受器进行光学显微镜观察，发现细胞体可分为多个叶。通常有一个叶相对清晰且半透明（R叶），但有时也有几个。与轴突相邻的叶（A叶）表面有纹理。扫描电子显微镜显示，微绒毛覆盖R叶表面，而A叶表面没有。当一个昏暗的光点照射到R叶时，诱发单光子反应的概率比同样的光点照射到A叶时高两到三个数量级。我们得出结论，细胞对光的敏感性主要取决于R叶。
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