Sexual anatomy
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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

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Sexual anatomy

Sexual Anatomy

Female-External

Female-Internal

Male-External

Male-Internal


Male external sex organs

Male External Sex Organs

  • The external sexual organs of the human male:

    • Scrotum

    • Testes

    • Penis


Male external sex organs1

Male External Sex Organs


Scrotum

Scrotum

  • 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.


Scrotum1

Scrotum

  • 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.


Testes

Testes

  • 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)


Testes1

Testes

  • 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.


Male external sex organs2

Male External Sex Organs


Penis

Penis

  • 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.


Penis1

Penis

  • 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.


Penis2

Penis

  • 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


Penis3

Penis

  • 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.


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