1. Sexual Anatomy
Male-External

2. Male External Sex Organs
The external sexual organs of the human male:
Scrotum
Testes
Penis

3. Scrotum
Defined: (Scrotal Sac) External pouch of skin beneath the penis that contains the testicles.
Normally hangs loosely from a man’s abdominal wall.
Consists of Two Layers:
Outermost Layer: Covering of thin skin that usually is a darker color than other body skin.
Second Layer: Composed of smooth muscle fibers and connective tissue.

5. 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.
As the temperature of the testes rises sperm production decreases.
Relatively few nerve endings in the scrotum.

6. Testes Produce sperm. Primary source of testosterone.
Two separate compartments:
Each houses a single testicle.
Left hangs lower than the right.
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Spermatic Cord: Suspends the testes within the scrotum.
Vas Deferens
Blood Vessels
Nerves
Fibers
Cremasteric Muscles
(which influence the position of the testicle in the scrotal sac and are affected by temperature and sexual stimulation)

7. Penis
Two functions:
Passage of urine from the bladder to the exterior.
Passage of sperm from the testes to the exterior.
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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.

8. Penis Prepuce: (Foreskin) Skin that covers the
glans of an uncircumcised penis.
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Shaft of penis:
Corpus Spongiosum:
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.
Corpora Cavernosa:
Structures in the shaft of the penis that engorge with blood during sexual arousal.
Run along the top of the shaft.

9. Male External Sex Organs

10. Penis Reaches adult proportions at approximately 15 years of age.
Erection:
Accomplished by a sudden influx of blood into the corpus spongiosum and the corpora cavernosa.
Crura:
Attach the penis to the pelvic bones.
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Average Penis Size:
Flacid-3.5 inches
Erect inches
98% of the male population falls within
this range inches.
The median penis size is smaller than the mean. (This means that most males are smaller than the average).

11. Penis Body Part Correlation Coefficient middle finger to palm distance
0.25
length of thumb
length of big toe
0.18
shoe size
0.08

12. Penis