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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
  • 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).