Abstract
A fine adjustment of sperm head size and shape occurs during maturation and storage within the male excurrent duct of the rabbit. This remodelling, as judged by morphometric values of area, perimeter, length, width, and shape factors, takes place mostly in passage from the seminiferous tubules of the testis to the distal caput of the epididymis. The dimensions of sperm heads from the distal corpus of the epididymis break the general tendency toward a reduction in size and more elliptical shapes. A period of transport and storage within the epididymal cauda and vas deferens follows in which there are no further changes in sperm head morphometry. It can be concluded that the period immediately following sperm release from the testis is crucial to the final morphological maturation of spermatozoa. Moreover, the fact that changes are detected in the appearance of sperm heads at successive stages of sperm maturation suggests that the dimensions of a particular epididymal spermatozoon may be taken as an approximate indication of its relative maturity.
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