An experimental study of spinal nerve segmentation in Amblystoma with reference to the plurisegimental contribution to the brachial plexus
An experimental study of spinal nerve segmentation in Amblystoma with reference to the plurisegimental contribution to the brachial plexus
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DOI：
10.1002/jez.1400670303
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发表时间：
1934-04-01
影响因子：
--
通讯作者：
Detwiler, SR
中科院分区：
文献类型：
--
作者：
Detwiler, SR
切除Amblystoma胚胎中的臂体节后，脊神经节的不完全和不规则分割，臂神经的非典型排列以及这些神经中的一个或多个偶尔完全丧失。神经数量减少的肢体能够进行正常的运动。在肢体原基背侧插入1 ~ 2个多余的中胚层段，可相应增加神经节和臂神经的数目。在这种情况下，肢体可能由4或5条脊神经供应，而不是典型的第（3）条。仅通过插入额外的中胚层体节产生额外的脊髓神经是提供实质性的实验。证明的观点提出的莱曼，“27（见B。A. 2（6/8）：13982）和作者先前的支持，即脊神经节和相关神经的分割从属于中胚层同色异谱。在不同的脊椎动物的臂丛神经节段的神经贡献的变化的原因进行了讨论。
Excision of the brachial somites in Amblystoma embryos is followed by the incomplete and irregular segmentation of the spinal ganglia, by an atypical arrangement of the brachial nerves and by the occasional complete loss of one or more of these nerves. Limbs with a reduced no. of nerves are capable of performing normal movements. By interpolating 1 or 2 supernumerary mesodermic segments dorsal to the limb rudiment, the no. of ganglia and brachial nerves may be correspondingly increased. In such cases the limb may be supplied by 4 or 5 spinal nerves instead of the typical no. (3). The production of supernumerary spinai nerves by merely interpolating additional mesodermic somites is offered as substantial exp. proof of the view proposed by Lehmann, ''27 (see B. A. 2(6/8): 13982) and its previous support by the author, that the segmentation of spinal ganglia and associated nerves is subservient to mesodermal metamerism. Causes for variations in the segmental nerve contribution to the brachial plexus in different groups of vertebrates are discussed.