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LOCALIZATION OF THE 'APICAL BODY' IN GUINEA-PIG AND HUMAN SPERMATOZOA WITH PHOSPHOTUNGSTIC ACID

Recent data on mammalian spermatozoa have revealed that profound changes take place in the acrosome before the spermatozoon penetrates the zona pellucida of the ovum. The plasma membrane and the outer membrane of the acrosome vesiculate, releasing the acrosomal contents (Austin & Bishop, 1958; Austin, 1963; Hadek, 1963; Piko & Tyler, 1964; Barros, Bedford, Franklin & Austin, 1967; Bedford, 1967b). The inner acrosome membrane then becomes the outer ensheathment of the sperm head. Under these circumstances, the contents of the compartment between the inner acrosome membrane and the nucleus may be important for the movement of the spermatozoon through the zona and fusion of spermatozoon and ovum.

Since it resides in the subacrosomal space at the apex of the nucleus, the 'apical body' is in a strategic

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				I. Thérien, R. Moreau, and P. Manjunath Bovine Seminal Plasma Phospholipid-Binding Proteins Stimulate Phospholipid Efflux from Epididymal Sperm Biol Reprod, September 1, 1999; 61(3): 590 - 598. [Abstract] [Full Text]