2. LEARNING OBJECTIVES
• At the end of this lesson everyone should be
able to:
Understand the meaning of internal male
reproductive organs.
List the functions of male reproductive
system.
Explain each internal male reproductive organ.
3. INTRODUCTION
• The internal male reproductive organs are the
structures inside the male body that play a
crucial roles in the reproductive process.
These internal organs includes;
A. Vas Deferens(ductus deferens)
B. Seminal Vesicles
C. Ejaculatory Ducts
D. Urethra
E. Prostate gland
F. Bulbourethral glands
4. FUNCTIONS OF MALE REPRODUCTIVE
SYSTEM
Aid in produce sperm and the male sex
hormone testosterone.
The ducts transport, store, and assist in
maturation of sperm.
The accessory sex glands secrete most of the
liquid portion of semen.
The penis contains the urethra, a passageway
for ejaculation of semen and excretion of
urine.
5. A. VAS DEFERENS(DUCTUS DEFERENS)
Introduction
• It is a long,thick muscular tube that extend from the
epididymis to the pelvic cavity behind the urinary bladder.
• Its about 45cm long and 2mm diameter.
Structure
• It has the ampulla of vas deferens that create the way to
ejaculatory duct from the epididymis.
• It is made up of largely smooth muscle arranged in three
layers which are
a) Inner layer made up of longitudinal smooth muscle
b) Intermediate layer made up of circular smooth muscle
c) Outer layer made up of longitudinal smooth muscle
6. Function of Vas deferens
• Transports mature sperm to the urethra in
preparation for ejaculation.
Blood supply
• Artery supply from branches of Internal illiac
arteries.
• Vein drainage in the testicular vein.
Nerve supply
• Innervated by genitofemoral nerve
7.
8. B.SEMINAL VESICLES
Introduction
• These areb convoluted pouchlike structures, lying posterior to
and at the base of the urinary bladder anterior to the rectum.
• Its about 5 cm in length.
Functions based on composition
They secrete an alkaline which helps to neutralize the acidic
environment of the male urethra and female reproductive
tract.
They secrete viscous fluid that contains fructose that provides
sperm with a source of energy and helps with the sperms’
ability to move (motility)
They secrete vesicles fluid that contain clotting proteins help
semen coagulate after ejaculation.
9. Blood supply
• Artery supply from branches of Internal illiac
arteries.
Nerve supply
• Innervated by sympathetic nerve suppy.
Lymphatic drainage
• The lymphatic drainage of the seminal vesicles
is external and internal iliac lymph nodes
10. C. EJACULATORY DUCTS
Introduction
• Is about 2 cm long and is formed by the union
of the duct from the seminal vesicle and the
ampulla of the ductus (vas) deferens.
• The short ejaculatory ducts form superior
portion of the prostate and pass inferiorly and
anteriorly through the prostate.
• They terminate in the prostatic urethra, where
they eject sperm and seminal vesicle
secretions just before the release of semen
from the urethra to the exterior.
11. Functions of ejaculatory duct
• Transport of seminal fluid which is a
combination of secretions from various glands
along the male reproductive tract.
• Propel the semen in the urethra with the help
of muscles surrounding it.
12. D. URETHRA
Introduction
• Urethra is the vessel responsible for
transporting urine from the bladder to an
external opening in the perineum.
• It is lined by stratified columnar epithelium
which is protected from the corrosive urine by
mucus secreting glands.
13. Structure
• The urethra is divided into three parts which
are;
a) Prostatic urethra is 2–3 cm long and passes
through the prostate that receives the
ejaculatory ducts and prostatic fluid that
contains alkaline fluid.
b) Membranous (intermediate) urethra is 1cm
long that continues from inferior part of the
prostate urethra.
c) Spongy (penile) urethra, which is about 15–
20 cm long. The spongy urethra ends at the
external urethral orifice.
14. E. PROSTATE GLAND
Introduction
• The prostate is a doughnut-shaped gland
which surrounds the prostatic urethra.
• It is located below the urinary bladder in front
of the rectum.
Functions
• The prostate secretes a milky like, slightly
acidic fluid (pH about 6.5) that contains
several substances which are
15. Citric acid used by sperm for ATP production.
Several proteolytic enzymes, such as prostate-
specific antigen (PSA), pepsinogen, lysozyme,
amylase, and hyaluronidase, eventually break
down the clotting proteins from the seminal
vesicles
Seminalplasmin in prostatic fluid is an
antibiotic that can destroy bacteria.
16. F. BULBOURETHRAL GLANDS
Introduction
• The paired bulbourethral glands or Cowper’s
glands each about the size of a pea, lie inferior
to the prostate on either side of the urethra.
Functions
• It secretes an alkaline substance that protects
the passing sperm by neutralizing acids from
urine in the urethra.
• It secretes mucus that lubricates the end of the
penis and the lining of the urethra, thereby
decreasing the number of sperm damaged
during ejaculation
17. REFERENCE
• Fraser, D. M., Cooper, M.A., & Nolte
A.G.W. (2010). Myles Textbook for
Midwives. Latest ed. ICN.MERCK.
Churchill Livingstone: (Latest ed)
• Principles of Human anatomy Gerard J. Tortora
& Mark T. Nielsen( 12th edition0
