SEXUAL ANATOMY
o
Male-External
MALE EXTERNAL SEX ORGANS

The external sexual organs of the human male:
Scrotum
 Testes
 Penis

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.
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.
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)

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.

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.

MALE EXTERNAL SEX ORGANS
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:
o Attach the penis to the pelvic bones.
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 Average Penis Size:
 Flacid-3.5 inches
 Erect-5.1-5.9 inches
 98% of the male population falls within
this range-4.23-7.53 inches.
 The median penis size is smaller than the mean. (This
means that most males are smaller than the average).
PENIS
Body Part
Correlation
Coefficient
middle finger to
palm distance
0.25
length of thumb
0.25
length of big toe
0.18
shoe size
0.08
PENIS