Fig. 3

Forebody body wall organisation in Eudiplozoon nipponicum. A-B. Histological sections showing the forebody wall musculature and parenchyma. LM, MT. C. Detail of freeze-fractured muscle bundles. FE, TEM. D. Syncytium and body wall musculature. TEM. E. General view of tegument organisation. TEM. F. High magnification of the basal lamina underlain by a circular muscle layer. Note the endoplasmic reticulum in the syncytium, just above the basal plasma membrane. TEM. apm – apical plasma membrane, bl – basal lamina, bpm – basal plasma membrane, cm – circular muscle fibres, efpm – exoplasmic fracture face of the plasma membrane, er – endoplasmic reticulum, m – body wall musculature, mf – bundles of myofibrils, mi – mitochondria, n – nucleus, nf – nerve fibres, p – parenchyma, pfpm – protoplasmic fracture face of the plasma membrane, pm – perpendicular muscle fibres, sc – syncytium