白腰文鸟发声相关核团体积在发育中的变化及神经机制  

Change and Its Neural Mechanism of Volumes of Song Control Nuclei During Development in the Striated Mannikin (Lonchura striata swinhoei)

作　　者：曾少举[1] 张信文[2] 左明雪[1] 

机构地区：[1]北京师范大学生命科学学院,北京100875 [2]海南师范学院生物系,海南海口571158

出　　处：《Zoological Research》2002年第6期456-462,共7页动物学研究（英文）

基　　金：国家自然科学基金资助项目 ( 3996 0 0 14 ;39870 0 97)

摘　　要：首先研究了 5～ 12 0日龄雌雄白腰文鸟 (Lonchurastriataswinhoei) 4个主要发声核团 (RA、LMAN、AreaX和HVC)的体积变化 ,再通过神经示踪技术研究这些核团与其他核团神经联系的建立时间 ,以了解发声核团发育及性别分化的神经机制。结果表明 :①雌雄RA体积均在 2 0、 30日龄前后表现出急剧的变化和雌雄差异 ;雌雄RA在 15和 2 5日龄分别接受LMAN和HVC的神经支配。②雌雄LMAN体积分别在 2 0、 30日龄前先增长 ,之后均缩小。雌雄LMAN的神经元大小均在 15和 2 0日龄间急剧增长 ,但在该时段之后 ,不再发生明显变化。雌雄LMAN均在 15日龄接受RA的神经支配。③AreaX核体积、神经元大小最明显的变化位于 2 0～ 2 5日龄间 ;雌雄AreaX核均在 15日龄时接受HVC的神经支配。④雌雄HVC体积变化的最大值在 2 0和 30日龄前后。雄鸟HVC的神经元大小在 2 0、 30日龄前后 ,雌鸟在 15～ 2 0日龄发生较大的变化 ,其余组间变化小或不明显。雌雄HVC分别在 15、 2 5日龄同AreaX核、RA建立神经联系。因此 ,4个发声核团组织学的明显变化与核团间神经联系的建立相关 ,说明发声核团间的神经联系可能影响和决定了核团体积在发育中的变化。The present study investigated the changes of volumes of four vocal control nuclei:robust nucleus of the archistriatum (RA),lateral magnocellular nucleus of the anterior neostriatum(LMAN),Area X and high vocal center (HVC) during development in the songbird,Striated Mannikin (Lonchura striata swinhoei).By using of neural tract-tracing methods,the process of neural connectivity within the four nuclei was studied to further understand the neural mechanism of development and sexual differentiation of vocal control nuclei in songbirds.The results were as follows:①Both male and female RA volumes most significantly changed around 20 or 30 days,and the sexual differences in volumes occurred around 20 or 30 days.Both male and female RA received efferent fibers from LMAN and HVC around 15 or 25 days respectively.②Both male and female LMAN volumes experienced first increase and subsequent decrease.However,the peaks of changes of female LMAN volumes were 10-day delay compared to those of males.The LMAN volumes both in males and in females changed most rapidly in two periods:from 20 to 25 days age and from 30 to 40 days during the whole development.The neural connections between LMAN and RA established around 15 days age in both males and females.However,female LMAN received fewer connections than male LMAN.③Area X volume changed most rapidly from 20 to 25 days.Area X received HVC efferent fibers around 15 days.Female Area X received fewer connections than male Area X.④Both male and female HVC volumes changed significantly around 20 or 30 days.The establishment of neural connection between HVC and Area X or between HVC and RA was around 15 days or 25 days respectively.The present study suggested that the time when the volume of vocal control nuclei changed significantly was approximately corresponded to the time of establishment of neural connection(s) among the vocal control nuclei.Thus the neural development of vocal control nuclei or their sexual differences might be correlated to the establishment of their own ne

关 键 词：发声控制核团 神经联系 性二型 白腰文鸟 发声相关核团体积 发育 变化 神经机制 

分 类 号：Q42[生物学—神经生物学]