通过扫描电子显微镜阵列断层扫描揭示大鼠会厌中上皮内神经末梢与上皮细胞之间的相互关系。
Interrelationship Between Intraepithelial Nerve Endings and Epithelial Cells in the Rat Epiglottis Revealed by Array Tomography With Scanning Electron Microscopy.
作者信息
Yamamoto Yoshio, Sasaki Kuniaki, Komuro Misaki, Yokoyama Takuya, Nakamuta Nobuaki
机构信息
Laboratory of Veterinary Anatomy and Cell Biology, School of Veterinary Medicine, Iwate University, Morioka, Japan.
Center for Electron Microscopy, Iwate University, Morioka, Japan.
出版信息
J Comp Neurol. 2025 Aug;533(8):e70085. doi: 10.1002/cne.70085.
Nerve endings in the laryngeal mucosa interact with epithelial cells to generate sensory discharges against various external stimuli. In the present study, we performed array tomography with scanning electron microscopy to examine the morphological interrelationship between intraepithelial nerve endings and epithelial cells in the rat epiglottis. In the epiglottic mucosa, thin nerve fibers/endings and ramified nerve endings were observed in the epithelial layer. Thin nerve fibers/endings had varicosities and terminal swellings, and ran in the shallow grooves of epithelial cells. The varicosities and terminal regions of the nerve fibers/endings were partially associated with epithelial cells, without any identifiable cell junctions or synaptic specializations. On the other hand, intraepithelial ramified nerve endings were detected in the stratified cuboidal epithelium at the base of the epiglottis. The ramified nerve ending consisted of a branched parent axon and large terminal parts that were approximately 3-6 µm in major axis length with irregular contours. The terminal parts of the ramified endings containing numerous mitochondria were closely attached to epithelial cells, as observed in the thin nerve fibers/endings. In conclusion, intraepithelial nerve endings in the epiglottis were in close contact with laryngeal epithelial cells and may be excited by mediators released from epithelial cells in response to various stimuli from the laryngeal lumen.
喉黏膜中的神经末梢与上皮细胞相互作用,以产生针对各种外部刺激的感觉放电。在本研究中,我们进行了阵列断层扫描和扫描电子显微镜检查,以研究大鼠会厌中上皮内神经末梢与上皮细胞之间的形态学相互关系。在会厌黏膜中,上皮层可见细神经纤维/末梢和分支神经末梢。细神经纤维/末梢有膨体和终末膨大,走行于上皮细胞的浅沟内。神经纤维/末梢的膨体和终末区域部分与上皮细胞相关联,未见任何可识别的细胞连接或突触特化。另一方面,在会厌底部的复层立方上皮中检测到上皮内分支神经末梢。分支神经末梢由一条分支的母轴突和大的终末部分组成,其长轴长度约为3-6μm,轮廓不规则。如在细神经纤维/末梢中所见,含有大量线粒体的分支末梢终末部分与上皮细胞紧密相连。总之,会厌中的上皮内神经末梢与喉上皮细胞紧密接触,可能被上皮细胞因喉腔内各种刺激而释放的介质所激活。
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