Activation process of a Taenia solium oncosphere. At the beginning of the activation process, an oncosphere completely surrounded by the oncospheral membrane is seen (A). With time, the oncospheral membrane is detached and seen above and below the oncosphere (B). At the end, the hexacanth is seen almost completely out of the oncospheral membrane, which remains, at the right side (C). Hooks are evident in (A) and (B).