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the first stage of formation of spermatozoa, in which the spermatogonia develop into spermatocytes and then into spermatids.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


That part of spermatogenesis in which the spermatogonia give rise to primary spermatocytes.
See also: spermatogenesis.
Farlex Partner Medical Dictionary © Farlex 2012


The entire process by which spermatogonial stem cells divide and differentiate into spermatozoa.
See also: spermiogenesis
Synonym(s): spermatocytogenesis.
[spermato- + G. genesis, origin]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012