accessory sex organs; accessory genitalia
Anatomical term for reproductive structures other than the primary gonads, such as ducts and glands. Used in medical and biological contexts.
Accessory sex organs include the vas deferens and the prostate gland.
生殖器 is a broader term for reproductive organs in general, while 副生殖器 specifically refers to the accessory structures.
Compound of 副 (ふく, 'accessory, secondary') and 生殖器 (せいしょくき, 'reproductive organs').