HESS A
J Biophys Biochem Cytol. 1958 Nov 25;4(6):731-42. doi: 10.1083/jcb.4.6.731.
The abdominal nerve cord of Periplaneta americana was studied utilizing light and electron microscopes. In the nerve cells, delicate granules, similar to those probably responsible for cytoplasmic basophilia, are evenly distributed in "dark" cells and clumped in "light" cells. Neuroglial cells are stained metachromatically by cresyl violet. The neuroglial cells have many processes which ramify extensively and are enmeshed to form overlapping layers. These imbricated processes ensheath the nerve cells; the inner layer of the sheath penetrates into the neuron and is responsible for the appearance of the trophospongium of Holmgren. Nerve fibers are embedded within glial cells and surrounded by extensions of the plasma membrane similar to mesaxons. Depending on their size, two or several nerve fibers may share a single glial cell. Nerve fibers near their terminations on other nerve fibers contain particles and numerous, large mitochondria. The ganglion is ensheathed by a thick feltwork of connective tissue and perilemmal cells. The abdominal connective has a thinner connective tissue sheath which is without perilemmal cells. The nerve fibers and sheaths in the connective become thinner as they pass through ganglia.
利用光学显微镜和电子显微镜对美洲大蠊的腹神经索进行了研究。在神经细胞中，类似于可能导致细胞质嗜碱性的精细颗粒，均匀分布在“暗”细胞中，并聚集在“亮”细胞中。神经胶质细胞用甲酚紫进行异染。神经胶质细胞有许多广泛分支的突起，并相互交织形成重叠层。这些叠瓦状突起包裹着神经细胞；鞘的内层穿透神经元并形成霍尔姆格伦营养海绵体。神经纤维嵌入胶质细胞内，并被类似于轴系膜的质膜延伸所包围。根据其大小，两根或几根神经纤维可能共用一个胶质细胞。在其终止于其他神经纤维附近的神经纤维含有颗粒和大量的大线粒体。神经节被一层厚厚的结缔组织和神经束膜细胞网络所包裹。腹神经索有一层较薄的结缔组织鞘，没有神经束膜细胞。结缔组织中的神经纤维和鞘在穿过神经节时会变细。
