Male Reproductive
System
Mr. Drozjock
What’s it’s purpose???
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The purpose of the organs of the male
reproductive system is to perform the following
functions:
To produce, maintain, and transport sperm
(the male reproductive cells) and protective
fluid (semen)
To discharge sperm within the female
reproductive tract during sex
To produce and secrete male sex hormones
responsible for maintaining the male
reproductive system
Components
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Unlike the female reproductive system, most of the male reproductive
system is located outside of the body. These external structures include the
penis, scrotum, and testicles.
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Penis: This is the male organ used in sexual intercourse.
 Three parts:
 Root: which attaches to the wall of the abdomen
 Shaft (body)
 Glans: cone-shaped part at the end of the penis.
 The glans, also called the head of the penis, is covered
with a loose layer of skin called foreskin. This skin is
sometimes removed in a procedure called circumcision.
The opening of the urethra, the tube that transports
semen and urine, is at the tip of the penis. The penis also
contains a number of sensitive nerve endings.
The Penis
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The body of the penis is made up of special, sponge-like
tissue. This tissue contains thousands of large spaces that fill
with blood when the man is sexually aroused. As the penis fills
with blood, it becomes rigid and erect, which allows for
penetration during sexual intercourse. The skin of the penis is
loose and elastic to accommodate changes in penis size
during an erection.
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Semen, which contains sperm (reproductive cells), is expelled
(ejaculated) through the end of the penis when the man
reaches sexual climax (orgasm). When the penis is erect, the
flow of urine is blocked from the urethra, allowing only semen
to be ejaculated at orgasm.
The Scrotum
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Scrotum:
 loose pouch-like sac of skin that hangs behind and
below the penis.
 contains the testicles (also called testes), as well as
many nerves and blood vessels.
 acts as a "climate control system" for the testes. For
normal sperm development, the testes must be at a
temperature slightly cooler than body temperature.
Special muscles in the wall of the scrotum allow it to
contract and relax, moving the testicles closer to the
body for warmth or farther away from the body to
cool the temperature.
Testicles
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aka testes
oval organs about the size
of large olives that lie in
the scrotum, secured at
either end by a structure
called the spermatic cord.
most men have two testes
make testosterone and
generate sperm.
inside are coiled masses
of tubes called
seminiferous tubules responsible for producing
sperm cells.
Sperm
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Consists of:
 head (carries DNA)
 Tail (propels it)
The life span of sperm after they're ejaculated depends
on the environmental conditions. Sperm ejaculated into
a woman's vagina remain alive in the mucus of the
cervix and are able to fertilize an egg for three to five
days. Sperm ejaculated outside the body usually live
only a few hours.
100 million – 300 million sperm per ejaculation (you may
see estimates as low as 40 million and as high as 400
million – use 300 million as the average).
Semen
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Semen is made of:
 Sperm
 Fluid from Seminal Vesicles (energy)
 Fluid from Prostate Gland (nourish)
 Fluid from Cowper’s Gland (lubricate &
neutralize acidity)
Epididymis
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a long, coiled tube that rests on the backside of each testicle.
transports and stores sperm cells that are produced in the testes.
also brings the sperm to maturity, since the sperm that emerge from
the testes are immature and incapable of fertilization.
during sexual arousal, contractions force the sperm into the vas
deferens.
Vas Deferens
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long, muscular tube that travels from the
epididymis into the pelvic cavity, to just
behind the bladder.
The vas deferens transports mature sperm
to the urethra, the tube that carries urine or
sperm to outside of the body, in preparation
for ejaculation.
Ejaculatory Ducts & Urethra
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Ejaculatory ducts: formed by the fusion of the
vas deferens and the seminal vesicles. The
ejaculatory ducts empty into the urethra.
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Urethra is the tube that carries urine from the
bladder to outside of the body. In males, it has
the additional function of ejaculating semen
when the man reaches orgasm. When the
penis is erect during sex, the flow of urine is
blocked from the urethra, allowing only semen
to be ejaculated at orgasm.
Seminal vesicles
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sac-like pouches that attach to the vas
deferens near the base of the bladder.
produce a sugar-rich fluid (fructose) that
provides sperm with a source of energy to
help them move. The fluid of the seminal
vesicles makes up most of the volume of a
man's ejaculatory fluid, or ejaculate.
Prostate Gland
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walnut-sized structure that is located below
the urinary bladder in front of the rectum.
contributes additional fluid to the semen
which help to nourish the sperm.
the urethra runs through the center of the
prostate gland.
Cowper's Glands or
Bulbourethral Glands
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pea-sized structures located on the sides of
the urethra just below the prostate gland.
produce a clear, slippery fluid that empties
directly into the urethra. This fluid serves to
lubricate the urethra and to neutralize any
acidity that may be present due to residual
drops of urine in the urethra.
Hormones
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Follicle-stimulating hormone (FSH)
 necessary for sperm production/spermatogenesis
Luteinizing hormone (LH)
 stimulates the production of testosterone, which is
also needed to make sperm.
Testosterone
 responsible for the development of male
characteristics, including muscle mass and
strength, fat distribution, bone mass, facial hair
growth, voice change, and sex drive.
Health Issues of the Male
Reproductive System
Good hygiene & preventative health care are
important to a healthy system:
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wear protective gear when playing sports
avoid wearing tight clothing
practice good hygiene
not circumcised, wash underneath foreskin
monthly self testicular exams
annual physical exam
Health Issues (cont)
Problem
What it is
Symptoms
Treatment
Jock itch
Fungal infection of groin Itchy rash
area; exposure to
moisture & heat
increase risk
Keep area cool
&dry; OTC
creams
Cystitis
(bladder
infection)
Inflammation of bladder
due to bacterial
infection
Swelling bladder, Antibiotics
burn during
urination, blood in
urine, strong urine
smell, fever
Prostatitis
Bacterial infection –
prostate – may be tied
to STI
Swelling, fever,
pain in pelvis,
abdomen, testes,
low back, hurt
when urinate
Antibiotics
Health Issues (cont)
Inguinal hernia
Bulging of intestines
through weakness
of abdominal wall
into scrotum
Abnormal bulge in Immediate
abdomen,
medical care;
scrotum, groin –
surgery
sense of
heaviness/pain
Testicular
torsion
Twisting of the
testes on the
nerve/blood vessels
attached to it; can
happen in sports or
sudden movements
Elevation of
testes, swelling,
tenderness of
scrotum/abdomen
w/ nausea/pain
Immediate Mx
care-removal of
affected testis can
result if treatment
delayed
Undescended
testes
One/both testes do
not move from
abdomen to
scrotum during fetal
development
One or no testes
in the scrotum
Surgery or
hormone therapy
Health Issues (cont)
Prostate
Cancer
Abnormal division of
cells in prostate, may
be hereditary
Difficulty urinating
Surgery, radiation
defecating, burning
&/or chemo
when urinating, blood
in urine or no
symptoms
Testicular
Cancer
Abnormal division of
cells in a testis; may
be hereditary
Lump on , testes,
Surgery, radiation
enlargement,
&/or chemo
heaviness in scrotum
or no symptoms.
Most common 15-35
yrs old.
Health Issues (cont)
Infertility
Inability of the sperm to
None noticeable
fertilize an egg. May be
because low sperm count
or immobile sperm due to
testicular trauma,
pesticides, drug abuse,
exposure to lead, lifestyle
and environmental
factors, genetics?
Fertility drugs,
medical
procedures