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THE MALE REPRODUCTIVE
SYSTEM
THE REPRODUCTIVE SYSTEM
 Male and female reproductive systems
develop from similar embryonic tissue.
 First few weeks of...
DESCENT OF THE TESTES
 Ovoid structures about 5 cm long and 3 cm wide.
 Located within the scrotal sac (scrotum)
 Durin...
MALE REPRODUCTIVE SYSTEM
5
SCROTUM
 Sac of skin and superficial fascia that hangs
outside the abdominopelvic cavity at the root of
the penis
 Con...
INSIDE THE SCROTUM
 Each testes is
enclosed by the
tunica vaginalis, a
continuation of the
peritoneum that lines
the abdo...
TESTICLE
 The tunica albuginea gives rise to septa
(partitions) that divide the testis into lobules
(about 250)
 Each lo...
8
SPERMATIC CORD
 Contains the structures
running from the
testicles to the pelvic
cavity.
 Passes through the
inguinal ...
9
ACCESSORY GLANDS:
SEMINAL VESICLES
 Lie on the posterior wall of the bladder and secrete
60% of the volume of semen
 S...
10
ACCESSORY GLANDS:
PROSTATE GLAND
 Doughnut-shaped gland that encircles part
of the urethra inferior to the bladder
 P...
11
BULBOURETHRAL GLANDS
(COWPER’S GLANDS)
 Pea-sized glands inferior to
the prostate
 Produce alkaline mucus
prior to ej...
12
13
14
SEMINIFEROUS TUBULES
15
EPIDIDYMIS
 Epididymis: Storage and maturation area for
sperm
 The duct of the epididymis has stereocilia
that:
Abso...
16
SPERMATOGENESIS
 Spermatogenic stem cells of the seminiferous tubules give
rise to sperm in a series of events
 Mitos...
17
SPERMIOGENESIS:
SPERMATIDS TO SPERM
18
SPERM
 Sperm have three major regions
1. Head :contains DNA and has a helmet-like
acrosome containing hydrolytic enzym...
19
SPERM SUMMARY
 Produced: Seminiferous tubules
 Stored: Epididymis
 Transported through epididymis by rhythmic
perist...
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The male reproductive system

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The male reproductive system

  1. 1. THE MALE REPRODUCTIVE SYSTEM
  2. 2. THE REPRODUCTIVE SYSTEM  Male and female reproductive systems develop from similar embryonic tissue.  First few weeks of development, male and female embryos are indistinguishable.  Adult reproductive systems share some functional similarities.
  3. 3. DESCENT OF THE TESTES  Ovoid structures about 5 cm long and 3 cm wide.  Located within the scrotal sac (scrotum)  During fetal development they are near the kidneys and slowly move inferiorly in the abdominal cavity.  During the 7th month they descend through the inguinal canals
  4. 4. MALE REPRODUCTIVE SYSTEM
  5. 5. 5 SCROTUM  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  Its external positioning keeps the testes 3°C lower than core body temperature
  6. 6. INSIDE THE SCROTUM  Each testes is enclosed by the tunica vaginalis, a continuation of the peritoneum that lines the abdominopelvic cavity.  A fibrous capsule covers each testis called the tunica albuginea.
  7. 7. TESTICLE  The tunica albuginea gives rise to septa (partitions) that divide the testis into lobules (about 250)  Each lobule contains 3 or 4 highly coiled seminiferous tubules  These converge to become rete testis which transport sperm to the epididymis
  8. 8. 8 SPERMATIC CORD  Contains the structures running from the testicles to the pelvic cavity.  Passes through the inguinal canal  Contents:  Vas Deferens  Nerves  Blood Vessels
  9. 9. 9 ACCESSORY GLANDS: SEMINAL VESICLES  Lie on the posterior wall of the bladder and secrete 60% of the volume of semen  Seminal fluid:  Fructose: provides energy for the sperm.  Fibrinogen: helps turn semen into a bolus that can be readily propelled into the vagina.  Prostaglandins: decrease cervical mucus viscosity and stimulate reverse peristalsis of the uterus.  Join the ductus deferens to form the ejaculatory duct
  10. 10. 10 ACCESSORY GLANDS: PROSTATE GLAND  Doughnut-shaped gland that encircles part of the urethra inferior to the bladder  Plays a role in the activation of sperm  Enters the prostatic urethra during ejaculation  Prostatic secretions include: Citrate: is a food source (TCA cycle) Proteolytic enzymes: acts to "decoagulate" the semen that was coagulated by seminal vesicle secretions, which helps the sperm begin their journey once inside the vagina
  11. 11. 11 BULBOURETHRAL GLANDS (COWPER’S GLANDS)  Pea-sized glands inferior to the prostate  Produce alkaline mucus prior to ejaculation that neutralizes traces of acidic urine in the urethra
  12. 12. 12
  13. 13. 13
  14. 14. 14 SEMINIFEROUS TUBULES
  15. 15. 15 EPIDIDYMIS  Epididymis: Storage and maturation area for sperm  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
  16. 16. 16 SPERMATOGENESIS  Spermatogenic stem cells of the seminiferous tubules give rise to sperm in a series of events  Mitosis of spermatogonia, forming spermatocytes  Meiosis forms spermatids from spermatocytes  Spermiogenesis: spermatids form sperm
  17. 17. 17 SPERMIOGENESIS: SPERMATIDS TO SPERM
  18. 18. 18 SPERM  Sperm have three major regions 1. Head :contains DNA and has a helmet-like acrosome containing hydrolytic enzymes that allow the sperm to penetrate and enter the egg 2. Midpiece: contains mitochondria spiraled around the tail filaments 3. Tail :a typical flagellum produced by a centriole
  19. 19. 19 SPERM SUMMARY  Produced: Seminiferous tubules  Stored: Epididymis  Transported through epididymis by rhythmic peristaltic contractions as they mature  Epididymis Vas Deferens  Ejaculatory duct (ampulla of vas deferens fuses with duct of seminal vesicle “ejaculatory duct”)  prostate prostatic urethra (then passes the bulbourethral gland) membranous urethra  penile urethra

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