Gardiner D B, Silverman H, Dietz T H
Biol Bull. 1991 Jun;180(3):453-465. doi: 10.2307/1542346.
The gills of freshwater mussels perform many functions that depend on water flow through the water canals and channels. Regulation of water flow depends in part on ciliary activity and in part on the contraction of musculature underlying the gill filament and water channel epithelium. Obliquely striated muscles control water canal openings (ostia) at the base of the filaments and also at the entry into the water channel (internal ostia, IO). The muscles adjacent to the ostia are oriented in an anterior-posterior direction (perpendicular to gill filaments), and those controlling the internal ostia are oriented in a dorso-ventral direction (parallel to gill filaments). Small bundles of fibers radiate from the major dorso-ventral IO muscle bands and appear to insert at the base of the water canal epithelial cells at the canal-channel junction. Both muscular bands are closely associated with the branchial nerves in the gill. When gills are exposed to 10-5 M serotonin in vitro, both ostial openings dilate and gill ciliary activity increases. The net result of serotonin treatment is an increase in ciliary activity, a maximal opening of the water canal ostia, and, presumably, an increase in water flow through the gill.
淡水贻贝的鳃执行许多功能，这些功能依赖于水流经水道和通道。水流的调节部分取决于纤毛活动，部分取决于鳃丝和水道上皮下方肌肉组织的收缩。斜纹肌控制着鳃丝基部的水道开口（小孔）以及进入水道处（内孔，IO）的开口。靠近小孔的肌肉沿前后方向排列（垂直于鳃丝），而控制内孔的肌肉沿背腹方向排列（平行于鳃丝）。小束纤维从主要的背腹内孔肌带辐射出来，似乎插入到水道-通道交界处的水道上皮细胞基部。这两条肌肉带都与鳃中的鳃神经密切相关。当鳃在体外暴露于10^-5 M的血清素时，小孔开口都会扩张，鳃纤毛活动增加。血清素处理的最终结果是纤毛活动增加、水道小孔最大程度张开，并且推测鳃中的水流增加。
