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Sexual Anatomy. Female-External Female-Internal Male-External Male-Internal. Male External Sex Organs. The external sexual organs of the human male: Scrotum Testes P enis. Male External Sex Organs. Scrotum.

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sexual anatomy

Sexual Anatomy





male external sex organs
Male External Sex Organs
  • The external sexual organs of the human male:
    • Scrotum
    • Testes
    • Penis
  • Defined: (Scrotal Sac) External pouch of skin beneath the penis that contains the testicles
    • Normally hangs loosely from a man’s abdominal wall
    • Directly beneath the penis.
  • Consists of Two Layers:
    • Outermost Layer: Covering of thin skin that usually is a darker color than other body skin.
      • Becomes sparsely covered with pubic heir during puberty
    • Second Layer: Composed of smooth muscle fibers and connective tissue.
  • Scrotum’s primary function is to maintain the temperature at which the testes most effectively produce sperm.
  • Average scrotal temperature is lower than body temperature by approximately 3.1 degrees Centigrade (5.6 degrees Fahrenheit).
  • Keeping the testes outside the body cavity keeps them cool and assures maximum sperm production.
  • As the temperature of the testes rises sperm production decreases.
    • Men are advised to wear boxer shorts if they are having trouble conceiving.
  • Relatively few nerve endings in the scrotum.
    • Some men find scrotal stimulating highly arousing.
  • When a male is “kicked in the balls,” the pain results from damage to the testes, not the scrotum.
  • Defined: Male reproductive organs within the scrotum.
    • Produce sperm.
    • Primary source of testosterone.
  • Within the scrotal sac: Two separate compartments:
    • Each houses a single testicle.
    • Each testis is suspended within the scrotum by the spermatic cord.
  • Spermatic Cord: Suspends the testes within the scrotum.
    • Contains-
      • Vas Deferens
      • Blood Vessels
      • Nerves
      • Fibers
      • CremastericMuscles

(which influence the position of the testicle in the scrotal sac and are affected by temperature and sexual stimulation)

  • The testes can be contracted voluntarily:
    • Supposedly, some practitioners of Asian martial arts learn to retract the testes fully into the body cavity to protect them during combat.
  • Two Major Functions:
    • Secretion of sex hormones.
    • Production of sperm.
  • In most men the testes are asymmetrical (not the same shape and size).
    • Left testicle often hangs lower than the right since the left spermatic cord is longer than the right.
  • Defined: Male sexual organ
  • Two functions:
    • Passage of urine from the bladder to the exterior.
    • Passage of sperm from the testes to the exterior.

Divided into three major areas:

  • Glans:Located at the tip of the penis.
  • Shaft: Body of the penis.
  • Root: Portion of the shaft that extends internally and is attached to the pelvic bones.
  • Prepuce: (Foreskin) Skin that covers the glans of an uncircumcised penis.

The shaft of the penis contains nerves, blood vessels, fibrous tissue, and three parallel cylinders of spongy tissue:

  • Corpus Spongiosum: (Spongy body) Structure at the base of the penis that extends up into the shaft and forms the penile glans.
  • Urethra: Runs through the middle of the corpus spongiosum.
    • Urine and sperm pass through the urethra and exit at the urethral meatus, the uninary opening of the glans.
  • Corpora Cavernosa: (Cavernous Bodies) Structures in the shaft of the penis that engorge with blood during sexual arousal.
    • Run along the top of the shaft.
  • To accomplish the penises second function the penis must stiffen or become erect:
    • Accomplished by a sudden influx of blood into the corpus spongiosum and the corpora cavernosa.
    • At the root of the penis, the corpora cavernosa branch into tips called crurathat are attached to the pelvic bones.
    • Walruses have bone’s in their penises that are associated with erections.
    • Extensive network of muscles at the base of the penis, but the penis itself does not contain much muscle tissue
  • Reaches adult proportions at approximately 15 years of age.
  • Interesting: Some people believe that you can predict penis length by a man’s height or shoe size.
    • Neither body height nor foot size serve as practical estimators of penis length.
male genital cutting
Male Genital Cutting
  • Circumcision - Surgical cutting away or removal of foreskin.
  • Supercision - Making a slit in the length of the foreskin on the top.
  • Subincision - Making a slit on the lower side of the penis along its entire length.