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用光学显微镜、相差显微镜、透射电镜、扫描电镜对３种淡水育珠蚌外套膜表皮细胞的分泌方式进行了观察研究。几种显微镜观察对比研究的结果表明，外套膜细胞的分泌方式主要有小泡式的局部分泌；液流式、缺口式的顶浆分泌和巨浆分泌；分泌物排出时连同整个细胞一起排出和形成复层表皮后外层脱落的全浆分泌。内表皮细胞以小泡式和缺口式分泌为主；外表皮细胞多为液流式分泌和全浆分泌。内表皮分泌活动表现为持续性和连续性的特点，观察相邻细胞同时可见到各种不同的分泌时相；外表皮分泌活动呈节律性和区段性的特点，分泌活动旺盛的细胞区段和无分泌活动的区段相间出现。以上结果表明内、外表皮细胞在分泌方式及分泌物性质上均有显著差异，这种差异反映了内、外表皮功能上的不同。
The secretions of epidermal cells from three kinds of freshwater pearl mussels were observed with optical microscope, phase contrast microscope, transmission electron microscope and scanning electron microscope. Several kinds of microscopic observation of the comparative study showed that the main ways of secretion of mantle cells are vesicular-type local secretion; fluid flow, gap-type apocrine secretion and secretion of giant plasma; excretion discharged together with the entire cell and After the formation of stratified epidermal shedding of whole pulp secretion. Endothelial cells are vesicular and gap-type secretions; mostly epidermal cells are fluid-secreted and whole-plasma secreted. Endocrine secretory activity is characterized by continuity and continuity, the observed adjacent cells at the same time can see a variety of different secretion phase; exocrine secretory activity was rhythmic and segmental characteristics, secrete active cell segments Secreted and non-sectoral segments appear. The above results show that the inner and outer epidermal cells in secretion and secretions were significantly different in nature, this difference reflects the inner and outer epidermis functional differences.