Arkett S A, Mackie G O, Singla C L
Biol Bull. 1987 Dec;173(3):513-526. doi: 10.2307/1541697.
Intracellular recordings from pre-oral ciliated cells of competent Calliostoma ligatum veligers were used to demonstrate the mechanisms of neuronal control of ciliary locomotion. During normal ciliary beating at 5-7 Hz, the membrane potential shows no oscillations or spiking activity. It remains at a resting potential of about -60 mV. Depolarization from resting potential is due to excitatory input from the CNS and, depending upon the kind of input, veligers appear to show two types of locomotory behavior. In one type, normal ciliary beating is periodically interrupted by rapid, velum-wide ciliary arrests. These arrests are caused by a propagated, Ca-dependent action potential in the pre-oral ciliated cells. The second type is characterized by either a velum-wide or local slowing of normal ciliary beating, and appears to result from a slow depolarization of the ciliated cell membrane. Pre-oral ciliated cells are electrically coupled to each other. This property may ensure the synchrony of velum-wide ciliary arrests or differential velar slowing of ciliary beating. These findings demonstrate some of the mechanisms ofthe fine control veligers possess over their locomotory and feeding behavior.
利用对有能力的扁玉螺幼体口前纤毛细胞的细胞内记录来证明纤毛运动的神经控制机制。在5 - 7赫兹的正常纤毛搏动期间，膜电位没有振荡或尖峰活动。它保持在约 - 60毫伏的静息电位。从静息电位的去极化是由于来自中枢神经系统的兴奋性输入，并且根据输入的类型，幼体似乎表现出两种类型的运动行为。在一种类型中，正常的纤毛搏动会被快速的、遍及膜的纤毛停止周期性打断。这些停止是由口前纤毛细胞中一种传播的、钙依赖性动作电位引起的。第二种类型的特征是正常纤毛搏动遍及膜或局部减慢，并且似乎是由纤毛细胞膜的缓慢去极化导致的。口前纤毛细胞彼此电耦合。这种特性可能确保遍及膜的纤毛停止的同步性或纤毛搏动的不同膜减慢。这些发现证明了幼体对其运动和摄食行为所拥有的一些精细控制机制。
