spermatozoide|The functional anatomy of the human spermatozoon: relating,threesome fucking videos

Abstrspermatozoideact. The 100,000 th scientific article on the subject of spermatozoa was recently published. Numerous studies evaluated the characteristics of this important cell that led to tremendous。

Sperm Morphology and Ultrastructure. A mature spermatozoon is a highly differentiated single cell that comprises head, midpiece and tail regions (Fig. 2A) all bounded。

spermatozoon [sper″mah-to-zo´on] (pl. spermatozo´a) (Gr.) a mature male germ cell, the specific output of the testes, which fertilizes the mature ovum (secondary oocyte) in sexual。

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