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Fig. 16 | BMC Developmental Biology

Fig. 16

From: Mantle margin morphogenesis in Nodipecten nodosus (Mollusca: Bivalvia): new insights into the development and the roles of bivalve pallial folds

Fig. 16

Histological sections through the inner mantle fold of Nodipecten nodosus. Sequence of sections (B–E) from proximal to distal region, showing gradual increase in margin-parallel musculature towards distal. Toluidine blue and basic fuchsin. a Schematic representation of the mantle margin, specifying the regions from the inner mantle fold that correspond to the sections seen in B–E. Ventral to the top. b Radial muscles from the mantle extend into the base of the inner fold. c At intermediate levels of the inner fold, there is a combination of radial and margin-parallel muscles. d Towards the margin, the connective tissue is reduced and margin parallel muscles increase in volume. e In the distal region, the radial muscles are compressed and margin-parallel muscles predominate. Abbreviations: rm, radial muscles; mp, margin parallel muscles

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