I found this diagram in my textbook regarding the process of spermatogenesis. But, I doubt if the labelling done is correct or not. Especially, I can't figure out any difference between the cells labelled as spermatids and those as spermatozoa. Also, I doubt the labelling of Sertoli cells. Please help me clarify my doubt. Diagrammatic sectional view of a seminiferous tubule

As per my textbook,

The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis. After spermiogenesis, sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation.

  • $\begingroup$ I edited your question to convert the image of text to actual searchable text. $\endgroup$
    – De Novo
    Jul 16 '18 at 18:12

Notice the cell labeled "spermatid" is still attached to the Sertoli cell. Once released from the Sertoli cell, spermatids are called spermatozoa.

This process (release of the spermatid to form a spermatazoon) is called spermiation


The text you added is still correct, but not well explained. Spermiogenesis is the development of the spermatid, the haploid 1N gamete produced by the second meiotic division, into a cell with a long flagella with a small amount of cytoplasm. Spermiation is the release from the sertoli cell. Both spermiogenesis and spermiation are involved in the development of a spermatid to a spermatozoon, but the specific point where we stop calling them spermatids and start calling them spermatozoa is release by the Sertoli cell, or spermiation, a substantial process in its own right. Both spermiogenesis and spermiation are important steps in the conversion of the haploid 1N gamete to a motile, free spermatozoon.

  • $\begingroup$ Your answer does not match at all to the theory in my book. Please see my edited question again and help me out. Thanks. $\endgroup$
    – DJ Koustav
    Jul 16 '18 at 17:55
  • $\begingroup$ @DJKoustav your text is still correct, but not well explained. $\endgroup$
    – De Novo
    Jul 16 '18 at 18:08
  • $\begingroup$ @DJKoustav If my answer doesn't fully answer your question now, let me know. Otherwise, please mark it the answer by checking the gray checkmark next to it. See someone answers. Thanks! $\endgroup$
    – De Novo
    Aug 3 '18 at 19:43

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