Carr C E, Maler L, Sas E
J Comp Neurol. 1982 Oct 20;211(2):139-53. doi: 10.1002/cne.902110204.
The electrosensory system of weakly electric gymnotiform fish is described from the receptor distribution on the body surface to the termination of the primary afferents in the posterior lateral line lobe (PLLL). There are two types of electroreceptor(ampullary and tuberous) and a single type of lateral line mechanoreceptor (neuromast). Receptor counts in Apteronotus albifrons show that (1) neuromasts are distributed as in other teleosts; (2) ampullary receptors number 151 on one side of the head and 208 on one side of the body; (3) tuberous receptors were estimated to number 3,000-3,500 on one side of the head and 3,500-5,000 on one side of the body. The distribution of each receptor type is described. Each receptor is innervated by a single primary afferent. Electrosensory afferents have myelinated cell bodies in the ganglion of the anterior lateral line nerve (ALLN). The distribution of these ganglion cell diameters is strongly bimodal in Apteronotus and Eigenmannia: The smaller-diameter cells may be those which innervate ampullary electroreceptors, the larger-diameter tuberous electroreceptors. Transganglionic HRP transport techniques were used to determine the first-order connections of the anterior lateral line nerve in six species of gymnotiform fish. Small branches of the ALLN were labeled so as to determine the somatotopic organization in the PLLL. The PLLL is divided into four segments from medial to lateral, termed medial, centromedial, centrolateral, and lateral segments (Heiligenberg and Dye, '81). Representations of the head are found rostrally in each zone, and the trunk is mapped caudally in each zone. Thus there are four body maps in the PLLL. The medial segment receives ampullary input (Heiligenberg and Dye, '82) and maps the dorsoventral body axis mediolaterally, as does the tuberous centrolateral segment. The tuberous centromedial and lateral segments map the dorsoventral axis lateromedially. Thus the medial and centromedial segments meet belly to belly, the centromedial and centrolateral segments meet back to back, and the centrolateral and lateral segments meet belly to belly. Adjacent electrosensory maps within the PLLL are therefore always mirror images.
本文描述了弱电裸背电鳗目鱼类的电感受系统，从体表的感受器分布到初级传入神经在后侧线叶（PLLL）的终止。电感受器有两种类型（壶腹型和结节型），侧线机械感受器有一种类型（神经丘）。对艾氏光尾电鳗的感受器计数表明：（1）神经丘的分布与其他硬骨鱼相同；（2）壶腹型感受器在头部一侧有151个，在身体一侧有208个；（3）结节型感受器估计在头部一侧有3000 - 3500个，在身体一侧有3500 - 5000个。描述了每种感受器类型的分布。每个感受器由单个初级传入神经支配。电感受传入神经在前侧线神经（ALLN）的神经节中有髓鞘化的细胞体。在艾氏光尾电鳗和艾氏电鳗中，这些神经节细胞直径的分布呈强烈的双峰分布：直径较小的细胞可能是支配壶腹型电感受器的，直径较大的是支配结节型电感受器的。运用跨神经节辣根过氧化物酶运输技术来确定六种裸背电鳗目鱼类前侧线神经的一级连接。标记ALLN的小分支，以确定PLLL中的躯体定位组织。PLLL从内侧到外侧分为四个部分，称为内侧、中央内侧、中央外侧和外侧部分（海利根贝格和戴，1981年）。头部的表征在每个区域的前部发现，躯干在每个区域的后部映射。因此，PLLL中有四个身体图谱。内侧部分接收壶腹型输入（海利根贝格和戴，1982年），并将背腹身体轴从内侧到外侧映射，结节型中央外侧部分也是如此。结节型中央内侧和外侧部分将背腹轴从外侧到内侧映射。因此，内侧和中央内侧部分腹部对腹部相接，中央内侧和中央外侧部分背靠背相接，中央外侧和外侧部分腹部对腹部相接。因此，PLLL内相邻的电感受图谱总是镜像关系。
