Fig. 1 in Echinococcus multilocularis (Cestoda, Cyclophyllidea, Taeniidae): functional ultrastructure of the penetration glands and nerve cells within the oncosphere

Fig. 1 Schematic diagram illustrating localization of three secretory regions of the egg of Echinococcus multilocularis: two types of the penetration glands (PG1 and PG2) and two nerve cells (NC) of neurosecretory type. Note the oncospheral tegument composed of its peripheral anucleated layer and submerged subepithelial perikaryon and the hook region membrane surrounding the somatophore pole of the hexacanth. To simplify the diagram, some other oncospheral structures or cell types such as somatic and hook muscle systems with their