一种罕见的细胞质环状片层

A RARE CYTOPLASMIC ANNULATE LAMELLAE

利用电镜观察到河鳗卵母细胞的细胞质中存在两种类型的环状片层(annulate lamel-lae)。其一为常见类型,它的特点是具有环轮的片层,平行排列成垛;另一种为罕见的环状片层,由具环轮的片层与膜状结构交替平行排列而成。两类环状片层的区别仅在于后者存在膜状结构。这种膜状结构的来源和功用,目前尚未查明。作者推测,它们可能与片层有类似的来源,或许起着一种“缓冲器”的作用。

Annulate lamellae(AL)in oocytes of eel,Anguilla japonica have been observed with electron microscopy.Two types of AL have been found in the cytoplasm of these cells,one of which is the common type,characterized by a stack of parallelly arranged lamellae with annuli(or rings)as shown in figure 1,another is a rare one,which appears as alternative arrangement of parellel lamellae with annuli and membrane-like structures as shown in figures 2~4.The only difference between them is the presence of membrane-like structure in the latter.The origin and function of the membrane-like structure have not been found out yet.It is suggested that this structure might be similar to above-mentioned lamellae in origin and might be a"buffer"in function.