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Electron Microscopic Study of Mature Bovine Spermatozoa¹

Department of Animal Husbandry, University of California, Davis

ABSTRACT

Characteristics of the normal bovine spermatozoa as revealed by electron micrographs have been reported. Detail of the head area reveals that the acrosomic granule is an integral structure within the acrosomic cap of the mature spermatozoa. The acrosomic cap overlaps the porous-appearing posterior nuclear cap. The midpiece containing outer axial fibrils of at least two different dimensions appears to have a diameter at least as great as the thickness of the head. Possible contractile elements of the fibrils are closely associated with the basal granules in the neck. Elements of the tail area also have been described.

¹ This investigation was supported in part by United States Public Health Service Grant RG 5868.