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Fig. 6 | BMC Zoology

Fig. 6

From: Eudiplozoon nipponicum: morphofunctional adaptations of diplozoid monogeneans for confronting their host

Fig. 6

Forebody tegument organisation in Eudiplozoon nipponicum. A. The outer zone of the syncytium lined by the apical plasma membrane and subjacent membrane. FE, TEM. B. A view of the syncytium, with putative secretory vesicles (black rectangles) connecting the subjacent and apical plasma membranes. FE, TEM. C. The putative secretory vesicles in detail. FE, TEM. D-E. Freeze-fractured apical plasma and subjacent membranes interrupted by secretory vesicles (black rectangles). FE, TEM. F. Protoplasmic fracture face of the subjacent membrane, revealing the presence of vesicle attachment sites (black circles). Note the dense layer of proteins (white arrows) separating the apical plasma membrane and subjacent membrane. FE, TEM. G. General view of the syncytium and the basal lamina. FE, TEM. apm – apical plasma membrane, bl – basal lamina, cm – circular muscle fibres, efapm – exoplasmic fracture face of the apical plasma membrane, efsm – exoplasmic fracture face of the subjacent membrane, pfapm – protoplasmic fracture face of the apical plasma membrane, pfsm – protoplasmic fracture face of the subjacent membrane, sc – syncytium, sm – subjacent membrane, v – vesicles, white arrow – dense protein layer

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