Petit H, Davis W L, Jones R G
Tissue Cell. 1978;10(4):619-27. doi: 10.1016/0040-8166(78)90050-2.
The scanning electron microscope has been used to describe the surface morphology of the mantle in mantle-shell preparations from the fresh-water mussel Amblema. In some regions (adductor muscle insertions), the mantle is firmly attached to the shell. In other areas (along the main course of the mantle), transient adhesions between the outer mantle epithelial cells and the nacre appear to temporally further compartmentalize the extrapallial fluid possibly as a prerequisite for the initial crystallization phenomenon. At the mantle edge, as well as at the isthmus, the periostracum was seen to extrude from the periostracal groove. At the siphonal edge, peculiar finger-like processes were identified; these may represent primitive photoreceptors. The epithelial cells of the outer mantle epithelium are all microvillated whereas those of the inner mantle epithelium are both microvillated and ciliated. Specific differences in surface morphology are described for various regions of the outer mantle epithelium. These may be related to precise regionalized functional differences of this tissue. Several functions of the mantle, in addition to shell formation, and based on its various morphologies, are also discussed.
扫描电子显微镜已被用于描述淡水贻贝安氏贻贝外套膜-贝壳制剂中外套膜的表面形态。在一些区域（闭壳肌附着处），外套膜与贝壳紧密相连。在其他区域（沿着外套膜的主要路径），外套膜外侧上皮细胞与珍珠层之间的瞬时粘连似乎暂时进一步分隔了外套膜外液，这可能是初始结晶现象的一个先决条件。在外套膜边缘以及峡部，可以看到角质层从角质层沟中挤出。在虹吸管边缘，发现了奇特的指状突起；这些可能代表原始的光感受器。外套膜外侧上皮细胞均有微绒毛，而外套膜内侧上皮细胞既有微绒毛又有纤毛。描述了外套膜外侧上皮不同区域表面形态的具体差异。这些可能与该组织精确的区域性功能差异有关。除了贝壳形成外，还基于其各种形态讨论了外套膜的几种功能。
