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The striated body: a new structure in the sperm head of the rabbit spermatozoon.

The striated body, a new structure lying in the perinuclear substance of rabbit spermatozoa, is described. It is composed of protein cords displaying a perpendicular periodic arrangement of dark and light bands. It appears in late spermatids, immediately prior to spermiation and is still present in epididymal spermatozoa, mostly, but not exclusively close to the perforatorium. The nature of this component has been analysed using a series of cytochemical techniques, as well as various antibodies and immunocytochemistry. The absence of RNA and of DNA favours a nonviral origin for this structure. The striated body is devoid of actin, differing in that respect from the rest of the perinuclear substance.