A few examples are given in Fig. 21, but a point ought to be emphasized: the channels delineated by the scalariform junctions (with very frequent MS complexes) are closed at one end (by a septate junction in homocellular junctions, or are blind in autocellular junctions) and open at the other end, either at the basal pole of the cell (facing the hemolymph) or in a sistem of intercellular spaces (intercellular sinus of Oschman and Wall, 1969), forming a compartment more or less isolated from the hemolymph (for discussions concerning the relationship between the intercellular sinus and the hemolymph, see Oschman and Wall, 1969; Wall and Oschman, 1973, 1975; Noirot and Noirot-Timothe/e, 1976).
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