Andres K H, von Düring M, Petrasch E
Abteilung für Neuroanatomie, Ruhr-Universität Bochum, Federal Republic of Germany.
Anat Embryol (Berl). 1988;177(6):523-35. doi: 10.1007/BF00305139.
Two types of electroreceptors, the ampullary and the tuberous electroreceptor (silurid knollenorgan) in the epidermis of the catfish, Pseudocetopsis spec., were investigated with semithin and ultrathin serial sections. The ampullary organ contains one or two sensory cells which are embedded in supporting cells at the base of open epithelial canals. They bear some slender microvilli on their apical surface and form several synaptic bars. The afferent myelinated nerve fiber arborizes in the connective tissue papilla and looses its myelin sheath about 30 micron below the supporting cell layer. A second thin myelinated axon occur up to the supporting cell layer. The tuberous electroreceptor organ contains one large receptor cell. Most of the cell body is exposed to the lumen of a specialized proximal canal segment and is closely covered with microvilli. A single myelinated axon looses its myelin sheath within the supporting cell layer about 1 micron before terminating as a flat calyx at the base of the sensory cell. A functional significance of the two types of receptors will be discussed.
利用半薄和超薄连续切片对鲶鱼（Pseudocetopsis spec.）表皮中的两种电感受器——壶腹电感受器和结节电感受器（鲶形目电觉器官）进行了研究。壶腹器官包含一或两个感觉细胞，这些细胞嵌入开放上皮管底部的支持细胞中。它们在顶端表面有一些细长的微绒毛，并形成几个突触带。传入的有髓神经纤维在结缔组织乳头中分支，并在支持细胞层下方约30微米处失去髓鞘。第二条细的有髓轴突一直延伸到支持细胞层。结节电感受器器官包含一个大的感受器细胞。细胞体的大部分暴露于一个特殊的近端管段的管腔中，并被微绒毛紧密覆盖。一条有髓轴突在支持细胞层内约1微米处失去髓鞘，然后在感觉细胞底部以扁平花萼的形式终止。将讨论这两种感受器的功能意义。
