Sonic Motor Nucleus and Its Connections with Octaval and Lateral Line Nuclei of the Medulla in a Rockfish, Sebastiscus marmoratus
Sonic Motor Nucleus and Its Connections with Octaval and Lateral Line Nuclei of the Medulla in a Rockfish, Sebastiscus marmoratus
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石斑鱼（Sebastiscus marmoratus）的声波运动核及其与延髓八轴核和侧线核的联系
DOI：
10.1159/000006623
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Hironobu Ito
中科院分区：
文献类型：
--
作者：
M. Yoshimoto;K. Kikuchi;N. Yamamoto;H. Somiya;Hironobu Ito
用辣根过氧化物酶(HRP)、生物细胞素和碳菁染料(DII)示踪法，对马氏梭鱼(Sebastiscus Marmoratus)的声学运动核及其纤维联系进行了研究。Sebastiscus有一个泳囊和一对外在的发音/鼓声肌肉。枕神经由发自声波运动核的两根腹根组成，同侧支配声波肌肉。声运动神经元分布于腹柱最腹侧，从延髓尾侧至吻侧脊髓，形成位于腹侧的柱状核。核内的每个神经元都有一个长而粗的树突和几个短的树突。长的树突向背侧延伸，在侧索内分枝，而短的树突在胞体周围分枝。将生物细胞素注入声速运动核后，两组运动前神经元被逆行标记，一组位于八字降核(DO)的背内侧，另一组位于延髓网状结构(RF)的内侧区。DO前运动神经元呈多极分布，胞体附近有多个树突分支，RF运动前神经元呈双极分布。RF运动前神经元的两个树突之一向外侧延伸至DO的腹侧部，另一个树突延伸至延髓的腹内侧区。在RF前运动神经元的腹内侧树突区，来自视顶盖(TO)和半圆环(TS)的下行纤维横穿顶盖延髓束，终止于双侧。DiI注入腹内侧树突区后，在双侧TS和TO可见逆行标记神经元。顶盖神经元主要位于灰质中央层。这些神经元在细胞层有两个短的基底树突分枝，一个长的顶端树突延伸到纤维层、灰质浅层和视层。纹状体神经元呈双极分布，分布于TS各处。此外，将生物细胞素注射到外侧线系统的内侧核显示，该核向两侧投射到RF运动前神经元。这些结果表明，声运动核前运动神经元位于延髓DO的背内侧部和RF的内侧区。提示声运动核通过DO前运动神经元接受听觉输入，通过内侧核接受侧线输入的RF前运动神经元，通过延伸至DO腹侧部分的外侧树突接受前庭输入，通过顶盖球束接受TO和TS的信息。
The sonic motor nucleus and its fiber connections were examined in a rockfish, Sebastiscus marmoratus by means of tracer methods using horseradish peroxidase (HRP), biocytin, and carbocyanine dye (DiI). Sebastiscus has a swimbladder and a pair of extrinsic sonic/drumming muscles. The sonic muscle is ipsilaterally innervated by the occipital nerve which is composed of two ventral roots arising from the sonic motor nucleus. The sonic motor neurons are distributed in the most ventral part of the ventral column from the caudal medulla to the rostral spinal cord, and form a ventrally located columnar nucleus. Each neuron in this nucleus possesses a long thick dendrite and several short dendrites. The long dendrite extends dorsolaterally and branches in the lateral funiculus, whereas the short dendrites branch around their cell bodies. After biocytin injections into the sonic motor nucleus, two groups of premotor neurons were retrogradely labeled bilaterally, one in the dorsomedial portion of the descending octaval nucleus (DO) and the other in the medial zone of the reticular formation (RF) in the medulla. The DO premotor neurons were multipolar with several dendrites branching near the cell bodies, and the RF premotor neurons were bipolar. One of the two dendrites of the RF premotor neurons extends laterally into the ventral portion of the DO, and the other dendrite extends into the ventromedial area in the medulla. In the ventromedial dendritic field of the RF premotor neurons, descending fibers arising from the optic tectum (TO) and torus semicircularis (TS) traverse in the tractus tectobulbaris and terminate bilaterally. After DiI insertion into the ventromedial dendritic field, retrogradely labeled neurons were found bilaterally in the TS and TO. The majority of tectal neurons were located in the stratum griseum centrale. These neurons had two short basal dendrites branching in the cell layer and a long apical dendrite extending to the stratum fibrosum et griseum superficiale and stratum opticum. The toral neurons were bipolar and were distributed throughout the TS. Furthermore, biocytin injections into the medial nucleus of the lateral line system revealed that the nucleus projects bilaterally to the RF premotor neurons. These results show that premotor neurons for the sonic motor nucleus are located in the dorsomedial portion of the DO and the medial zone of the RF in the medulla. It is suggested that the sonic motor nucleus receives auditory input via the DO premotor neurons and input from RF premotor neurons which receive lateral line input via the medial nucleus, vestibular input through the lateral dendrite extending into the ventral portion of the DO, and information from the TO and TS via the tractus tectobulbaris.
鲶鱼中参与声音产生的鳔和胸运动神经元的定位。
DOI：
10.1159/000113572
发表时间：
1994
期刊：
Brain, behavior and evolution
影响因子：
--
作者：
Ladich,F;Fine,ML
通讯作者：
Fine,ML
DOI：
10.1159/000116496
发表时间：
1989
期刊：
Brain, behavior and evolution
影响因子：
--
作者：
R. L. Puzdrowski
通讯作者：
R. L. Puzdrowski