Fig. 3From: Protection against suspended sand: the function of the branchial membrane in the blue mussel Mytilus edulis Drawing of the lowering of the branchial membrane (above, a and b) and outline of the direction of the inflow current at a contracted (left) and a lowered (right) branchial membrane. Part of the mantle surface with higher activity in eliminating sand is indicated. BRM branchial membrane, F foot, G gill, Pad posterior adductor muscleBack to article page