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The Collaborative International Dictionary
Spermatogonium

Spermatogonium \Sper`ma*to*go"ni*um\, n. [NL., fr. Gr. ????, ???, sperm + ??? offspring.] (Physiol.) A primitive seminal cell, occuring in masses in the seminal tubules. It divides into a mass (spermosphere) of small cells (spermoblast), which in turn give rise to spermatozoids.

Wiktionary
spermatogonium

n. (context biology English) Any of the undifferentiated cells in the male gonads that become spermatocytes; a spermatoblast

Wikipedia
Spermatogonium

A spermatogonium (plural: spermatogonia) is an undifferentiated male germ cell, originating in a seminiferous tubule and dividing into two primary spermatocytes (a kind of germ cell) in the production of spermatozoa.

There are three subtypes:

  • Type A(d) cells, with dark nuclei. These cells replicate to ensure a constant supply of spermatogonia to fuel spermatogenesis.
  • Type A(p) cells, with pale nuclei. These cells divide by mitosis to produce Type B cells.
  • Type B cells, which divide to give rise to primary spermatocytes.

Each primary spermatocyte duplicates its DNA and subsequently undergoes meiosis I to produce two haploid secondary spermatocytes. Each of the two secondary spermatocytes further undergo meiosis II to produce two spermatids (haploid). (1 primary spermatocyte => 4 spermatids)

The spermatids then undergo spermiogenesis to produce spermatozoa.

Usage examples of "spermatogonium".

When a spermatogonium was observed to change to a primary spermatocyte-still diploid-it would be segregated and at the instant it divided into two secondary spermatocytes-haploids, one with an X chromosome and one with a Y chromosome-they would be again segregated and each would be encouraged to develop into spermatozoa.

When a spermatogonium was observed to change to a primary spermatocyte—.