Ekström von Lubitz D K
Cell Tissue Res. 1981;215(3):651-65. doi: 10.1007/BF00233539.
The ultrastructure of the lateral-line neuromasts in the ratfish, Chimaera monstrosa is described. The neuromasts rest at the bottom of open grooves and consist of sensory, supporting, basal and mantle cells. Each sensory cell is equipped with sensory hairs consisting of a single kinocilium and several stereocilia. There are several types of sensory hair arrangement, and cells with a particular arrangement from patches within the neuromast. There are two types of afferent synapse. The most common afferent synapse has a presynaptic body and is typically associated with an extensive system of anastomosing tubules on the presynaptic side. When the tubules are absent, vesicles surround the presynaptic body. These synapses are often associated into synaptic fields, containing up to 35 synaptic sites. The second type of afferent synapse does not have a presynaptic body and is not associated with the tubular system. The afferent synapses of the second type do not form synaptic fields and are uncommon. The afferent synapses are either associated with a postsynaptic sac or more commonly with a strongly osmiophilic postsynaptic membrane. The accessory cells are similar to those in the acoustico-lateralis organs of other aquatic vertebrates. A possibility of movement of the presynaptic bodies and of involvement of the tubular system in the turnover of the transmitter is discussed. A comparison of the hair tuft types in the neuromasts of Ch. monstrosa with those in the labyrinth of the goldfish and of the frog is attempted.
描述了银鲛（Chimaera monstrosa）侧线神经丘的超微结构。神经丘位于开放沟的底部，由感觉细胞、支持细胞、基底细胞和套细胞组成。每个感觉细胞都配备有由一根动纤毛和几根静纤毛组成的感觉毛。感觉毛有几种排列类型，具有特定排列的细胞形成神经丘内的斑块。有两种传入突触。最常见的传入突触有一个突触前体，通常在突触前侧与一个广泛的吻合小管系统相关联。当小管不存在时，囊泡围绕突触前体。这些突触常聚集成突触场，包含多达35个突触位点。第二种传入突触没有突触前体，也不与小管系统相关联。第二种类型的传入突触不形成突触场，且不常见。传入突触要么与一个突触后囊相关联，要么更常见地与一个强嗜锇性的突触后膜相关联。辅助细胞与其他水生脊椎动物的听侧线器官中的细胞相似。讨论了突触前体移动以及小管系统参与递质更新的可能性。尝试比较了银鲛神经丘中的毛簇类型与金鱼和青蛙内耳中的毛簇类型。
