Millecchia R, Bradbury J, Mauro A
Science. 1966 Dec 2;154(3753):1199-201. doi: 10.1126/science.154.3753.1199.
The "olfactory nerve," the endoparietal eye, and the rudimentary lateral eyes of Limulus (polyphemus) contain simple photoreceptor cells that duplicate many of the electrical responses of the retinular cells of the lateral eye; the responses are a receptor potential consisting of aninitial transient phase and a subsequent steady phase,low-amplitude fluctuations, and a small locally regenerative response to pulses of both light and current. Photic stimulation does not induce conducted action potentials, but does increase the membrane conductance. The receptor potentialrequires the presence of sodium ions in the external medium. Measurements of action and absorption spectra indicate a photopigment whose maximum absorption is of light with wavelength of 535 nanometers. The functional significance of these cells has not been ascertained.
“嗅神经”、内顶眼以及鲎（美洲鲎）的退化侧眼都含有简单的光感受器细胞，这些细胞能复制侧眼光感受细胞的许多电反应；这些反应是一种感受器电位，由一个初始瞬态阶段和随后的稳定阶段、低幅度波动以及对光和电流脉冲的小幅度局部再生反应组成。光刺激不会诱发传导性动作电位，但会增加膜电导。感受器电位需要外部介质中存在钠离子。动作光谱和吸收光谱的测量表明存在一种光色素，其最大吸收波长为535纳米的光。这些细胞的功能意义尚未确定。
