Yoshie S, Kanazawa H, Fujita T
Department of Histology, Nippon Dental University School of Dentistry at Niigata, Japan.
Arch Histol Cytol. 1996 Dec;59(5):479-84. doi: 10.1679/aohc.59.479.
A transmission-electron microscope study of the rat circumvallate taste bud revealed that occasionally one and the same gustatory or Type III cell received innervation associated with subsurface cisterns as the Type II cell did, in addition to the ordinary afferent synapse. The subsurface cistern a flattened, smooth-surfaced saccular membrane system, hugged the plasma membrane of the gustatory cell along the boundary against the nerve terminal. The nerve terminal attaching to the cell was occupied with mitochondria and synaptic type vesicles. As these structural features resemble those of efferent synapses in certain other sensory cells including the inner ear hair cells, the gustatory cells dually innervated as demonstrated in the present study are presumably involved not only in the afferent but also in the efferent projection of nerves.
对大鼠轮廓乳头味蕾进行的透射电子显微镜研究显示，除了普通的传入突触外，偶尔会有同一个味觉细胞或III型细胞像II型细胞一样，接受与表面下池相关的神经支配。表面下池是一个扁平的、表面光滑的囊状膜系统，沿着与神经末梢相对的边界紧贴味觉细胞的质膜。附着在细胞上的神经末梢充满了线粒体和突触型囊泡。由于这些结构特征与包括内耳毛细胞在内的某些其他感觉细胞的传出突触相似，本研究中显示的双重神经支配的味觉细胞可能不仅参与神经的传入投射，还参与神经的传出投射。
