Sonic/vocal motor pathways in squirrelfish (Teleostei, Holocentridae)
Sonic/vocal motor pathways in squirrelfish (Teleostei, Holocentridae)
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DOI：
10.1159/000006674
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发表时间：
2000-06-01
影响因子：
1.7
通讯作者：
Bass, AH
中科院分区：
文献类型：
--
作者：
Carlson, BA;Bass, AH
类似于许多硬骨鱼，松鼠鱼（家庭Holocentridae）产生发声的肌肉收缩，导致振动的鱼鳔，我们使用生物素化的化合物，以确定的位置和程度的发声运动神经元相比，额外的运动神经元组，即那些红色和白色背轴上肌和鳃盖肌，位于邻近或附近的声音肌肉。声运动核（SMN）位于延髓尾侧和脊髓嘴侧，呈腹外侧，树突沿着延髓外侧缘向背侧呈密集束状延伸，轴突从枕腹侧神经根发出。生物胞素的跨神经元转运鉴定了SMN内和内侧相邻网状结构中的前运动神经元，这些神经元投射到对侧SMN，并更向吻侧投射到八翼外侧传出核和前隆起核，这表明在其他硬骨鱼中观察到的发声系统和八翼外侧系统之间的相互作用。支配红色和白色背肌的运动神经元在背运动柱中形成松散的聚集体，与内侧纵束相邻，通过腹侧脊神经根发出轴突，将纤维双侧发送穿过脊髓。面神经运动核内有盖运动神经元。松鼠鱼是Beryciformes目的代表性成员，其SMN的解剖学特征与近缘的Scorpaeniformes目的代表性成员相似，但与更远缘的Paracanthoprophinian和ostarioprophinian硬骨鱼目的SMN不同，因此这些结果表明棘尾目鱼类的SMN之间可能存在同源性。版权所有（C）2000 S. Karger AG，巴塞尔。
Similar to many teleost fish, squirrelfish (family Holocentridae) produce vocalizations by the contraction of muscles that lead to vibration of the swimbladder, We used biotinylated compounds to identify the position and extent of vocal motor neurons in comparison to additional motor neuron groups, namely those of red and white dorsal epaxial muscle and opercular muscle that are located adjacent to or near the sonic muscle. The sonic motor nucleus (SMN) was located in the caudal medulla and rostral spinal cord in a ventrolateral position with dendrites extending dorsally in a dense bundle along the lateral edge of the medulla and axons exiting via ventral occipital nerve roots. Transneuronal transport of biocytin identified premotor neurons within the SMN and in the medially adjacent reticular formation that projected to the contralateral SMN and more rostrally to the octavolateralis efferent nucleus and nucleus praeeminentialis, suggesting interactions between vocal and octavolateralis systems as seen in other teleosts, Motor neurons innervating the red and white dorsal muscle formed a loose aggregate in the dorsal motor column, adjacent to the medial longitudinal fasciculus, sending fibers bilaterally throughout the spinal cord with axons exiting via ventral spinal nerve roots. Opercular motor neurons were located within the facial motor nucleus. The anatomical characteristics of the SMN of squirrelfish, a representative member of the order Beryciformes, are similar to those of representative members of the closely related order Scorpaeniformes, but diverge from the SMN of more distantly related orders of paracanthopterygiian and ostariophysan teleosts, These results therefore suggest a possible homology among the SMNs of acanthopterygiian fishes. Copyright (C) 2000 S. Karger AG, Basel.