Abstract
IN a recent discussion1,2 on the position of the acrosome and centriole in the thysanuran spermatozoon, the necessity for electron microscopy was stressed. In Fig. 1, the Golgi body (acroblast ; G) is lying to one side of the very large acrosome (A). Below is the nucleus (N). The flagellum has grown out inside the cell and is cut across in three places (F1–3). On the right is a constantly occurring body (CA), which at present is considered to be a centriole adjunct, as in other micrographs it is found near the centriole. Cross-sections of the ripe or nearly ripe sperms are shown in Fig. 2. The anteriorly situated acrosome has become a scoop-shaped body (A), which passes back to form a tube (B), which joins the nucleus (C), which passes back to join the flagellum (F). No adnuclear thread or flagellum is found on the tubular nucleus, but there is an intranuclear body (X), which projects up into the funnel of the acrosome. This is probably what is seen with the light microscope in the form of an intra-nuclear flagellum. This body, however, does not possess the nagellar ultrastructures.
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Nath, V., Gupta, B. L., and Mittal, L. C., Nature, 186, 899 (1960).
Gatenby, J. B., and Mathur, R. S., Nature, 186, 900 (1960).
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MATHUR, R. Electron Microscopy of Thysanuran Spermiogenesis. Nature 188, 164 (1960). https://doi.org/10.1038/188164a0
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DOI: https://doi.org/10.1038/188164a0
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