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Testes

Testicles; Gonads - male

The testes are 2 egg-shaped male reproductive organs located in the scrotum. They produce sperm and the male hormone, testosterone.

References

Donohoue PA. Development and function of the gonads. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 600.

Kavoussi PK. Surgical, radiographic, and endoscopic anatomy of the male reproductive system. In: Wein AJ, Kavoussi LR, Partin AW, Peters CA, eds. Campbell-Walsh Urology. 11th ed. Philadelphia, PA: Elsevier; 2016:chap 21.

McKenney JK. Testis and testicular adnexa. In: Goldblum JR, Lamps LW, McKenney JK, Myers JL, eds. Rosai and Ackerman's Surgical Pathology. 11th ed. Philadelphia, PA: Elsevier; 2018:chap 27.

  • Male reproductive anatomy

    Male reproductive anatomy - illustration

    The male reproductive structures include the penis, the scrotum, the testes, the epididymis, the seminal vesicles, and the prostate.

    Male reproductive anatomy

    illustration

  • Sperm

    Sperm - illustration

    The male reproductive system creates sperm that is manufactured in the seminiferous tubules within each testicle. The head of the sperm contains the DNA, which when combined with the eggs DNA, will create a new individual. The tip of the sperm head is the portion called the acrosome, which enables the sperm to penetrate the egg. The midpiece contains the mitochondria which supplies the energy the tail needs to move. The tail moves with whip-like movements back and forth to propel the sperm towards the egg. The sperm have to reach the uterus and the fallopian tube in order to fertilize a womans egg.

    Sperm

    illustration

    • Male reproductive anatomy

      Male reproductive anatomy - illustration

      The male reproductive structures include the penis, the scrotum, the testes, the epididymis, the seminal vesicles, and the prostate.

      Male reproductive anatomy

      illustration

    • Sperm

      Sperm - illustration

      The male reproductive system creates sperm that is manufactured in the seminiferous tubules within each testicle. The head of the sperm contains the DNA, which when combined with the eggs DNA, will create a new individual. The tip of the sperm head is the portion called the acrosome, which enables the sperm to penetrate the egg. The midpiece contains the mitochondria which supplies the energy the tail needs to move. The tail moves with whip-like movements back and forth to propel the sperm towards the egg. The sperm have to reach the uterus and the fallopian tube in order to fertilize a womans egg.

      Sperm

      illustration


     

    Review Date: 9/23/2019

    Reviewed By: Sovrin M. Shah, MD, Assistant Professor, Department of Urology, The Icahn School of Medicine at Mount Sinai, New York, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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