Puzdrowski R L, Leonard R B
Marine Biomedical Institute, University of Texas Medical Branch, Galveston 77555-0843.
J Comp Neurol. 1993 Jun 1;332(1):21-37. doi: 10.1002/cne.903320103.
The central projections of the electrosensory, mechanosensory, and octaval nerves of the Atlantic stingray were examined by transganglionic transport of horseradish peroxidase. Particular attention was paid to the relation of the projections to cell plates C1 and C2, and to a newly described cell plate, C3. The electroreceptors in the stingray are found in three groups on the dorsal and ventral sides of the body. The electroreceptors are represented topographically on the ipsilateral dorsal nucleus. Those of the rostral part of the head and pectoral fins are represented on the rostroventral part of the nucleus, and those on the caudal part of the head and the pectoral fin on the dorsocaudal part of the nucleus. Mechanosensory lateral line afferents terminate within the ipsilateral intermediate and caudal nuclei, and the lateral granular mass of the vestibulocerebellum. Anterior lateral line afferents also project to the magnocellular octaval nucleus. A topographic representation of the mechanosensory lateral line periphery is present on the intermediate and caudal nuclei. Mechanoreceptors on the trunk are represented laterally and those on the head medially. The terminal field of the anterior lateral line afferents on the intermediate nucleus surrounds cell plates C1 and C2. The anterior lateral line afferents also project to the medial part of the lateral granular mass, whereas the posterior lateral line afferents project to the lateral portion. Sparse projections of anterior lateral line afferents to the periventricular octaval nucleus were also observed. The octaval nerve afferents terminate largely within the octaval column. Octaval nerve projections were also observed to the reticular formation, the periventricular octaval nucleus, the deep cerebellar nucleus, the vestibulocerebellum, particularly the lower lip and medial granular mass, and the intermediate nucleus. A sparse projection to cell plate C3 was found. The relation between cell plates C1 and C2 and the anterior lateral line afferents suggests that these cell plates are related to processing lateral line information. While the relationship between cell plate C3 and the octaval afferents is not strong, the sparse octaval projection C3 receives suggests that it is relaying octaval information.
通过辣根过氧化物酶的跨神经节运输，研究了大西洋黄貂鱼的电感觉神经、机械感觉神经和八鳃神经的中枢投射。特别关注了这些投射与细胞板C1和C2以及新描述的细胞板C3的关系。黄貂鱼的电感受器分布在身体背侧和腹侧的三组中。电感受器在同侧背核上呈拓扑分布。头部吻部和胸鳍的电感受器在核的吻腹侧部分有代表，而头部尾部和胸鳍的电感受器在核的背尾侧部分有代表。机械感觉侧线传入纤维终止于同侧中间核和尾核以及前庭小脑的外侧颗粒团。前侧线传入纤维也投射到大细胞八鳃核。中间核和尾核上存在机械感觉侧线外周的拓扑表示。躯干上的机械感受器在外侧有代表，头部的机械感受器在内侧有代表。中间核上前侧线传入纤维的终末场围绕细胞板C1和C2。前侧线传入纤维也投射到外侧颗粒团的内侧部分，而后侧线传入纤维投射到外侧部分。还观察到前侧线传入纤维向室周八鳃核的稀疏投射。八鳃神经传入纤维主要终止于八鳃柱内。还观察到八鳃神经投射到网状结构、室周八鳃核、小脑深部核、前庭小脑，特别是下唇和内侧颗粒团以及中间核。发现向细胞板C3的稀疏投射。细胞板C1和C2与前侧线传入纤维之间的关系表明，这些细胞板与处理侧线信息有关。虽然细胞板C3与八鳃传入纤维之间的关系不紧密，但C3接收到的稀疏八鳃投射表明它在传递八鳃信息。
