小龙虾神经纤维中的平行隔膜系统。
A system of parallel septa in crayfish nerve fibers.
作者信息
Peracchia C
出版信息
J Cell Biol. 1970 Jan;44(1):125-33. doi: 10.1083/jcb.44.1.125.
Abstract
Certain axons in the abdominal roots and nerve cord of crayfish contain a system of regularly spaced, parallel transverse septa with a periodicity of about 2 micro. Each septum is composed of two roughly parallel membranes, separated by a gap of 150-400 A. The two membranes are frequently fenestrated by pores 550-2000 A in diameter, each occupied by a microtubule. Filaments are occasionally seen bridging the gap between the microtubule and the edge of the pore. The membranes of the septa are continuous with longitudinal membranous tubules. In small- and medium-sized axons the septa are continuous across the axon, while in large axons they seem to be intact only at the periphery as annuli. It is suggested that such structures be called "fenestrated septa." With horseradish peroxidase as a tracer, no communication between the septal lumen and the periaxonal space was found.
摘要
小龙虾腹根和神经索中的某些轴突含有一种有规律间隔的平行横向隔膜系统，其周期约为2微米。每个隔膜由两个大致平行的膜组成，膜间间隙为150 - 400埃。这两个膜常常有直径为550 - 2000埃的小孔，每个小孔中有一根微管。偶尔可见细丝连接微管和孔边缘之间的间隙。隔膜的膜与纵向膜性小管相连。在中小型轴突中，隔膜横跨轴突连续存在，而在大型轴突中，它们似乎仅在外围以环的形式完整存在。建议将这种结构称为“有孔隔膜”。以辣根过氧化物酶作为示踪剂，未发现隔膜腔与轴突周隙之间有连通。
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