MALE REPRODUCTIVE SYSTEM
EXTERNAL STRUCTURES
FUNTIONS:
PENIS
1. Produce and Store Sperm
• Male sex organ
2. Produce male sex hormone Testosterone
• Incases urethra
PHYSICAL CHANGES IN MALE
•
•
•
•
•
•
•
•
growth spurt
acne
deeper voice
facial and body hair develops
broader shoulders
muscles get larger
perspiration increases
1st ejaculation occurs
DESCENT OF THE TESTES
Ovoid structures about 5 cm long and 3 cm wide.
Located within the scrotal sac (scrotum)
Scrotum-Incase testes
Sac of skin and superficial fascia that hangs outside the
abdominopelvic cavity at the root of the penis
Contains paired testicles separated by a midline septum
WALL OF THE SCROTUM
In the dermis, there is a thin layer of smooth muscle known
as the dartos muscle.
The cremaster muscle is a thicker layer of skeletal muscle
that lowers and raises the testes based on temperature.
INSIDE THE SCROTUM
 A fibrous capsule covers each testis called the tunica
albuginea.
Testes
The tunica albuginea gives rise to septa (partitions) that
divide the testis into lobules
 Each lobule contains 3 or 4 highly coiled seminiferous
tubules
 These converge to become rete testis which transport
sperm to the epididymis
sperm per minute Testosterone - hormones produced by
Testes - develop sexual characteristics
Epididymis (on top of each testicle)
• Sperm are stored and mature here
Epididymis: Storage and maturation area for sperm
 Its head joins the efferent ductules and caps the superior
aspect of the testis
 The duct of the epididymis has stereocilia that:
 Absorb testicular fluid
 Pass nutrients to the sperm
 Nonmotile sperm enter, pass through its tubes and
become motile (propelled by peristalsis)
 Upon ejaculation the epididymis contracts, expelling
sperm into the ductus deferens
MALE REPRODUCTIVE SYSTEM Function: - produce and store
sperm During 7th month, Testes can be seen Testes - 50,000