Dautov S S, Nezlin L P
Biol Bull. 1992 Dec;183(3):463-475. doi: 10.2307/1542023.
Transmission electron microscopy (TEM) and histochemical approaches were used to investigate the topology and ultrastructure of the nervous system of the tornaria larva of an enteropneust, Balanoglossus proterogonius. Cholinesterase activity was detected in the epithelium of the pre- and postoral ciliary bands. Groups of catecholamine-containing cells (CA) were detected at the anterior tip of larva, in the ventral epidermis behind the mouth, and in the stomach wall near its junction with the intestine. Single CA neurons were detected in the telotroch epithelium. Axon tracts are described in ciliary band epithelia. At the base of the aboral plate, epithelial nerve cells form a ganglion-like cluster. Single neuron-like cells and single axons and axonal tracts were found in the epithelium of digestive tract. The data were compared with ones from the literature and with those obtained from other marine invertebrate larvae. The properties of the neural elements and their possible functions are discussed.
利用透射电子显微镜（TEM）和组织化学方法，研究了肠鳃类动物原肠鳃（Balanoglossus proterogonius）担轮幼虫神经系统的拓扑结构和超微结构。在口前和口后纤毛带的上皮细胞中检测到胆碱酯酶活性。在幼虫的前端、口后方的腹侧表皮以及胃与肠交界处附近的胃壁中，检测到了含儿茶酚胺的细胞群（CA）。在尾纤毛上皮中检测到单个CA神经元。在纤毛带上皮中描述了轴突束。在反口板基部，上皮神经细胞形成一个神经节样的簇。在消化道上皮中发现了单个神经元样细胞、单个轴突和轴突束。将这些数据与文献中的数据以及从其他海洋无脊椎动物幼虫获得的数据进行了比较。讨论了神经元件的特性及其可能的功能。
