vasa ef·fer·en·tia -.ef-ə-'ren-ch(ē-)ə n pl the 12 to 20 ductules that lead from the rete testis to the vas deferens and except near their commencement are greatly convoluted and form the compact head of the epididymis
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(sing. vas efferens)
the many small tubes that conduct spermatozoa from the testis to the epididymis. They are derived from some of the excretory tubules of the mesonephros.
Medical dictionary. 2011.