Scanning electron microscope observations on the muscle innervation of Oikopleura dioica fol (appendicularia, tunicata) with notes on the arrangement of connective tissue fibres
Scanning electron microscope observations on the muscle innervation of Oikopleura dioica fol (appendicularia, tunicata) with notes on the arrangement of connective tissue fibres
复制标题
扫描电子显微镜观察 Oikopleura dioica fol（阑尾、被囊）的肌肉神经支配，并记录结缔组织纤维的排列
DOI：
10.1007/bf00223014
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发表时间：
1975
影响因子：
3.6
通讯作者：
P. Flood
中科院分区：
文献类型：
--
作者：
P. Flood
在扫描电子显微镜下观察了松材线虫(Oikopleura Dioica)附肢的临界点、干燥和断裂。背神经索内可见神经节细胞和周围神经纤维。粗大的周围神经纤维沿着尾巴以恒定的间隔成双侧离开神经索。这些纤维大部分来自裸露的神经索，但也有一些明显起源于从神经索本身突起的神经节。这些成对的周围神经在外侧肌细胞的内侧表面总是有精细的末端分支。因此，它们被解释为运动轴突。一些较细的周围神经纤维以不规则的间隔从神经索和神经节细胞发出。由于大量的细胞外纤维连接着表皮鳍和肌肉细胞的两侧层，这些细小的神经纤维很少被追踪到它们的终止。然而，有几个可以追溯到脊索和肌肉细胞之间的腹侧，似乎结束于单一的球状扩张。在这类神经的传输电子显微镜中，出现了一簇簇突触小泡，因此，人们认为它们携带着传出的脉冲。细胞外纤维排列成高度有序的图案，厚束穿过要相互连接的结构之间的缝隙，并在组织的表面上有许多辐射插入。
Critical point dried and fractured appendicularia of the speciesOikopleura dioicahave been examined in the scanning electron microscope. The dorsal nerve cord with ganglion cells and peripheral nerve fibres could easily be observed. Thick peripheral nerve fibres leave the nerve cord as bilateral pairs at constant intervals along the tail. Most of these fibres branch from the naked nerve cord, but some evidently originate in ganglion perikarya bulging out from the nerve cord itself. These paired peripheral nerves always have elaborate end-arborizations on the medial surface of the lateral muscle cells. They are accordingly interpreted as motor axons. Some thinner peripheral nerve fibres originate at irregular intervals from both the nerve cord and the ganglion cells. Due to the numerous extracellular fibrils that connect the bilateral layers of the epidermal fins and the muscle cells to each other, these thin nerve fibres can seldom be traced to their termination. A few ones can, however, be traced ventrally between the notochord and the muscle cells and seem to end in singular bulb-like expansions. Clusters of synaptic vesicles are present in transmission electron micrographs of such nerves, and they are accordingly believed to carry efferent impulses. The extracellular fibrils are arranged in a highly ordered pattern with thick bundles crossing the gap between the structures to be interconnected and with numerous radiating insertions on the surface of the tissues.