Fig. 5 in Echinococcus multilocularis (Cestoda, Cyclophyllidea, Taeniidae): functional ultrastructure of the penetration glands and nerve cells within the oncosphere

Fig. 5 Oncospheral secretory regions of the hexacanth of Echinococcus multilocularis and comparison of three types of their secretory granules. a Somatophore area of hexacanth showing few secretory regions containing three types of secretory granules: sg1, sg2, and nsg granules. Two types of penetration glands, PG1 and PG2, show evidently different types of their secretory granules sg1 and sg2. b–d Higher magnification TEM micrographs showing ultrastructural details of three types secretory granules. sg1 (or sg2) represents secretory granules of the first (or second) type of penetration glands and nsg are neurosecretory granules of neurosecretory cells. H oncospheral hook, HCh heterochromatin islands, HM hook musculature, m mitochondria, N nucleus, n nucleolus, NCP nerve cell process, OM oncospheral membrane, RA "rouleau"-shaped assemblages of secretory granules, SC somatic cell