Nadol J B
Ann Otol Rhinol Laryngol. 1981 Jan-Feb;90(1 Pt 1):12-7. doi: 10.1177/000348948109000104.
Reciprocal synapses have been found between nerve terminals and the outer hair cells in the human organ of Corti. A single nerve ending of the nonvesiculated type may possess two types of synaptic specialization of opposite polarity. The first is typical of the "afferent" synapse with a presynaptic body in the hair cell and pre- and postsynaptic membrane thickening.. The second consists of a small collection of presynaptic vesicles in the neural cytoplasm near the plasma membrane facing the hair cell and a subsynaptic cisterna within the hair cell cytoplasm. The second type of specialization is similar to the synapses seen in "efferent" endings. This suggests that both an afferent (hair cell to neuron) and efferent (neuron to hair cell) synaptic relationship may exist between an outer hair cell and a single nerve terminal.
在人类柯蒂氏器中，已发现神经末梢与外毛细胞之间存在相互突触。非囊泡型的单个神经末梢可能具有两种极性相反的突触特化类型。第一种是典型的“传入”突触，在毛细胞中有一个突触前体以及突触前和突触后膜增厚。第二种由面向毛细胞的质膜附近神经细胞质中的一小群突触前囊泡和毛细胞质内的一个突触下池组成。第二种特化类型类似于在“传出”末梢中看到的突触。这表明外毛细胞与单个神经末梢之间可能同时存在传入（从毛细胞到神经元）和传出（从神经元到毛细胞）的突触关系。
