Testis

The testicle (plural testes) is the male gonad in animals.  Like the ovaries to which they are homologous, testes are components of both the reproductive system and the endocrine system.  The primary functions of the testes are to produce sperm (spermatogenesis) and to produce androgens, primarily testosterone. (adapted from wikipedia)

Testis, young H&E loupe, (source: Blue Histology)

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