Sexual anatomy
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Sexual Anatomy. Male-Internal. Male Internal Sex Organs. Female and male sexual organs develop from similar tissue before birth . Primary Function: Production of semen. _______________________________________________________________________ Semen:

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Sexual anatomy

Sexual Anatomy


Male internal sex organs
Male Internal Sex Organs

  • Female and male sexual organs develop from similar tissue before birth.

  • Primary Function:

    • Production of semen.



  • Fluid containing sperm and secretions from the prostate and seminal vesicles (ejaculate).

  • Teaspoon of semen contains between 200 and 500 million sperm.

  • 99% of semen is composed:

    • Ascorbic and Citric Acids, Enzymes, Fructose, Water, Substances.

  • Average: teaspoonful.

  • Volume is influenced by:

    • Amount of time since the last ejaculation.

    • Duration of arousal prior to ejaculation.

    • Age (men tend to produce less ejaculate as they age).

Seminiferous tubules
Seminiferous Tubules

Thin coiled tubes located in the testicles in which sperm are produced (Spermatogenesis).

  • Contains 250 cone-shaped lobes.

  • Placed end to end they would span the length of two football fields

    Leydig’sCells: (Interstitial Cells) Produce Androgens

  • Close proximity to blood vessels allows direct secretion of androgens into the bloodstream

  • Androgens: Hormones that promote the development of male genitals and secondary sex characteristics.


  • Male reproductive cell

  • 1% of semen

  • Epididymis

    • Tightly coiled thin walled tube where sperm

      maturation is completed.

    • Attached to the back and top surface of each testis.

    • Sperm may be stored for several weeks.


      Vas Deferens:

    • Tubes that convey sperm from the testes to the ejaculatory duct of the penis.

    • Carries sperm up into the body cavity, where at the base of the bladder they form the ejaculatory ducts

    • The two ejaculatory ducts run through the prostate gland and connect to the urethra.

    Seminal vesicles
    Seminal Vesicles

    • Two small glands that lie behind the bladder and secrete fluid that combines with sperm in the ejaculatory ducts.

    • Secretion of the seminal vesicles is high in fructose (form of sugar)

      • Sugar serves as a nutrient for the sperm.

    Prostate gland
    Prostate Gland

    • Gland which lies just below the bladder and surrounds the urethra, that produces about 30% of the seminal fluid released during ejaculation.

    • The other 70% is produced by the seminal vesicles.

    • During arousal the muscular tissue of the prostate gland squeezes shut preventing urine from mixing with the semen.

    • If the prostate gland becomes enlarged the swelling can close off the ejaculatory ducts and urethra, making urination difficult and painful.

    Cowper s glands bulbourethral glands
    Cowper’s Glands (bulbourethral glands)

    • Located beneath the prostate that produce a clear, colorless liquid before ejaculation that neutralizes acid to prevent damage to the sperm.

    • When a man is sexually aroused these glands may produce a fluid secretion called pre-ejaculate (pre-cum).