Ueyama T, Mizuno N, Nomura S, Konishi A, Itoh K, Arakawa H
J Comp Neurol. 1984 Jan 1;222(1):38-46. doi: 10.1002/cne.902220104.
Central distribution of afferent and efferent components of the pudendal nerve was examined in the cat by the HRP method after applying HRP to the central cut end of the pudendal nerve. Retrogradely labeled neuronal cell bodies were located primarily in the feline homologue of the Onuf's X nucleus, constituting a slender longitudinal cell column in the ventral horn of the S1 and S2 cord segments. The Onuf's nucleus was present constantly from middle S1 to high S2 cord segments, and occasionally extended rostrally to high S1 or low L7, and caudally to middle S2, low S2, or high S3 cord segments. No sex differences were observed in the distribution pattern, number, and soma size of labeled neurons in the Onuf's nucleus. Transganglionically labeled dorsal root fibers were found to terminate ipsilaterally in the lamina I of the dorsal horn at levels of lower lumbar, sacral, and higher coccygeal cord segments and the gracile nucleus, and bilaterally with an ipsilateral predominance in the dorsal commissural gray and laminae III, IV, V, and VI of the dorsal horn at levels of lower lumbar, sacral, and higher coccygeal cord segments. Some labeled dorsal root fibers appeared to end ipsilaterally in the regions where the sacral parasympathetic preganglionic neurons have been shown to be located.
将辣根过氧化物酶（HRP）应用于阴部神经的中枢切断端后，采用HRP法在猫身上研究了阴部神经传入和传出成分的中枢分布。逆行标记的神经元细胞体主要位于奥努夫X核的猫同源物中，在脊髓S1和S2节段的腹角形成一个细长的纵向细胞柱。奥努夫核在脊髓S1中部至S2上部节段持续存在，偶尔向头端延伸至S1上部或L7下部，向尾端延伸至S2中部、S2下部或S3上部节段。在奥努夫核中，标记神经元的分布模式、数量和胞体大小未观察到性别差异。经神经节标记的背根纤维被发现同侧终止于腰下部、骶部和尾上部脊髓节段水平的背角I层和薄束核，并且在腰下部、骶部和尾上部脊髓节段水平的背角背连合灰质以及III、IV、V和VI层双侧终止，同侧占优势。一些标记的背根纤维似乎同侧终止于已显示骶副交感神经节前神经元所在的区域。
