1. Male Reproductive System
External Parts and Function

2. Male Reproductive System

3. Penis
The male organ for sexual intercourse
Erection-The process by which the
penis fills with blood in preparation for
intercourse
Circumcision-the removal of the
foreskin which covers the head of the
penis
– Usually done in the first 4 days of life
– Aids hygiene
– Does not affect sexual functioning

4. Scrotum
The pouch located behind the
penis which contains the testicles
Provides protection to the testicles
Controls temperature necessary for
sperm production and survival

5. Testes
Two round glands which descend into
the scrotum following birth
Produce and store sperm
Produce male sex hormone,
testosterone

6. Male Reproductive System
Internal Parts and Functions

7. Vas Deferens (sperm tube)
Passageway for sperm, leading from
the testicles and joining with the urethra

8. Seminal Vesicle
A sac-like structure, lying behind the
bladder, which secretes a thick fluid that
forms part of the semen

9. Urethra
The tube through which urine passes
from the bladder to the outside of the
body
Joins with the sperm tube to provide a
common outlet for urine and sperm
Closed to urine at the time of
ejaculation

10. Prostate Gland
A gland located in the male pelvis which
secretes a thin, milky fluid that forms
the part of the semen which stimulates
the movement of sperm

11. Cowper’s Glands (bulbourethral glands)
Two structures that lie below the prostate and empty
their secretions into the urethra
Secrete a drop or so of clear, slippery fluid during
sexual arousal
Precedes ejaculation
Contains viable sperm

12. Ejaculatory Ducts
Short, straight tube that passes into the
prostate gland and opens into the
urethra

13. Epididymis
A comma-shaped structure along the
upper rear surface of the testes where
sperm mature
Some sperm are stored here, but most
move to the vas deferens after they
mature

14. Seminiferous Tubules
A network of coiled tubules in the testes
Where sperm is produced

15. Sperm
The male sex cell
Too small to be seen without a microscope
Shape similar to tadpoles
Movement aided by lashing their tails
Production begins usually between age 12 to 14
Total number per ejaculation averages 500 million
Survival in the fallopian tubes may reach 7 days

16. Ejaculation
The release of semen from the penis

17. Semen
The fluid which passes out of the penis
at the time of ejaculation
Produced and stored in the seminal
vesicles and prostate gland
Clear color in young males due to low
sperm count
Whitish color develops as sperm count
increases

18. Nocturnal Emissions (Wet Dreams)
Related to the individual’s level of sexual awareness
and interest
Due to erection of the penis and subsequent
ejaculation during sleep
Triggered by sexual dreams and fantasies
Occurs most frequently in males who are not
engaging in masturbation or sexual intercourse
Mature sperm may or may not be present in the
seminal fluid
Occurs as nocturnal vaginal lubrication in girls