It is important to emphasize that the complex fecundation processes are directly controlled by hormone concentration in the female's reproductive tract influencing spermatozoid
capacitation that occurs at a specific moment depending on the species.
The ultrastructure of spermatozoids
in anuran amphibians was studied for phylogenesis (AGUIAR JR.
The spermatogonia and spermatocytes featuring the initial spermatic stages could be observed, while spermatozoids
may appear in the lumen.
Testosterone secreted by leyding cells is hecessary to develop and divided germinal cells which are the first phase of forming spermatozoid
For male acini, germinal cells sat within the inner wall of the acinus, with spermatocysts, spermatids, and spermatozoids
developing toward the lumen.
The results of the study revealed no significant negative effect of Kan Jang on male semen quality and fertility, but rather a positive trend with respect to the number of spermatozoids
in the whole ejaculate, the percentage of active (normokinetic) forms of spermatozoids
, and fertility indexes, together with a decrease in the percentage of inactive (diskinetic) forms of spermatozoids
In size and development, spermatozoids
of Ginkgo and most cycads
The last item lead us to suggest that in spite of the higher proportion in spermatophore weight and spermatozoid
count of feral males, the higher percentage of normal spermatozoids
in farmed shrimps compensates such inequalities, making farmed males a more reliable source of spermatozoids
for female fertilization given their availability and consistency.
Structural proof of the spermatozoid
releasing and attracting pheromone of Laminariales.
Moreover, one fourth of the infertile patients presents a normal seminal analysis, demonstrating that, probably in these cases of normozoospermia, the alterations occur only in the function of the spermatozoid
Among nonfeeding developers, Abatus cordatus, with a 15-[[micro]meter]-long spermatozoid
head and an egg 1300 [[micro]meter] in diameter, has the longest echinoid sperm after Phyllacanthus parvispinus (20 [[micro]meter]; Raff et al.
Measured under a light microscope, the spermatozoid
head exhibited a length of approximately 5 [micro]m, whereas the tail was approximately 50 [micro]m long.