T h e m a l e r e p r o d u c t i v e s y s t e m
F i g u r e 1 6 . 1
Sagittal section showing male reproductive organs
stores sperm and carries
them from epididymis to urethra during
sexual arousal by smooth muscle
is a pouch that holds the testes and —
epididymis. It is made of loose skin, fascia, and
smooth muscle. The scrotum keeps the testes at
a temperature 2-3°F below normal body
secrete an alkaline
viscous fluid rich in fructose,
prostaglandins, and clotting factors.
Seminal fluid protects sperm, provides
nutrients, and promotes sperm motility
carry sperm into
alkaline fluid and lubricating mucus
into the urethra during arousal.
consists of tightly coiled
ducts where sperm mature.
Testes (male gonads)
are paired oval
glands where sperm are produced and
testosterone is made.
secretes a milky, acidic fluid
(pH = 6.5) containing citric acid,
fructose to nourish sperm, acid
phosphatase (unknown function), and
protein-digesting enzymes called
prostate-specific antigens (PSA).
delivers sperm to the outside
and urine to the outside. It consists of
• spongy erectile tissue (corpora
cavernosa penis, corpus
• glans penis (enlarged end region)
• foreskin (if uncircumcised).
b. Anterior view of scrotum and testes
Spongy tissues of penis
carries urine and semen to the
outside of the body.
divides scrotum into
Muscles that contract when it’s cold to
move the testes closer to the body, and
help regulate testicular temperature for
normal sperm production:
• Cremaster muscle (skeletal muscle)
• Dartos muscle (smooth muscle)
holds blood vessels,
lymph vessels, nerves, muscles, and
Plexus of testicular vein
The Reproductive Organs Make, Deliver, and Receive the Sex Cells