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The fine structure of the hatched oncospheres of hymenolepsis nana

The fine structure of the hatched oncospheres of hymenolepsis nana

Japanese Journal of Parasitology 26(2): 51-62

EM observations were made on the hatched and activated oncospheres of H. nana. The outer surface of the oncosphere was composed of a cytoplasmic layer with numerous outfoldings and rested on the basal lamina. The somatic musculature lay beneath the basal lamina and covered the oncosphere. A number of hook muscles were distributed among the 6 oncospheral hooks and were attached to the connective tissue surrounding the bases and collars of the hooks. The hooks were composed of 3 layers. The penetration gland cells consisted of an enlarged basal area situated in the anterior half of the oncosphere, and narrow cytoplasmic projections extending beyond the basal lamina at the posterior surface of the body. These cells were filled with numerous membrane-bound secretory granules. Microtubules were situated in the peripheral cytoplasm of the gland. The apical cytoplasm of the gland cells protruded through the basal lamina and blebs of cytoplasm containing secretory granules were found between the basal lamina and the outer layer. The fine processes of the glandular cells contained small cored and clear vesicles near and between the muscle cells.

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Accession: 006677713

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