Male reproductive system

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Male reproductive system

  1. 1. Male Reproductive System (pg 6)
  2. 2. Male Reproductive System (pg 6)• Functions: Produce and transport sperm,introduce sperm into female vagina, andproduce hormones responsible fordevelopment of secondary male sexcharacteristics
  3. 3. Testes• Produce sperm
  4. 4. Testes• Produce sperm• Begin development high in abdominal cavity.Around 2 months before birth, they descendinto the scrotum
  5. 5. Testes• Produce sperm• Begin development high in abdominal cavity.Around 2 months before birth, they descendinto the scrotum• Testes are around 3 degrees cooler than bodytemperature. Necessary for production ofviable sperm.
  6. 6. Testes• Produce sperm• Begin development high in abdominal cavity.Around 2 months before birth, they descendinto the scrotum• Testes are around 3 degrees cooler than bodytemperature. Necessary for production ofviable sperm.• Cremaster muscle contracts when cold tobring the testes closer to the body for warmth
  7. 7. Duct system• Once produced in the testes, sperm movethrough a series of ducts to reach the outsideof the body. The ducts are theepididymis, ductus deferens, ejaculatoryduct, and urethra
  8. 8. Epididymis• Long tube (6 meters). Tightly coiled to formcomma-shaped organ that sits on top of testes
  9. 9. Epididymis• Long tube (6 meters). Tightly coiled to formcomma-shaped organ that sits on top of testes• When sperm leaves testes, they are unable to“swim” and incapable of fertilizing an egg
  10. 10. Epididymis• Long tube (6 meters). Tightly coiled to formcomma-shaped organ that sits on top of testes• When sperm leaves testes, they are unable to“swim” and incapable of fertilizing an egg• As sperm slowly move through theepididymis, they mature and become fertile
  11. 11. Ductus deferens (vas deferens)• Tube that carries sperm from the epididymisto the ejaculatory duct
  12. 12. Ductus deferens (vas deferens)• Tube that carries sperm from the epididymisto the ejaculatory duct• Vasectomy: surgical procedure that severs theductus deferens for birth control
  13. 13. Ejaculatory duct• Ductus deferens joins duct from the seminalvesicle to form a short ejaculatory duct
  14. 14. Ejaculatory duct• Ductus deferens joins duct from the seminalvesicle to form a short ejaculatory duct• Passes through the prostate gland and intothe urethra
  15. 15. Urethra• Passageway for urine and semen
  16. 16. Urethra• Passageway for urine and semen• 3 regions1. Prostatic urethra: passes through prostategland. Receives fluids from ejaculatory ductand prostate
  17. 17. Urethra• Passageway for urine and semen• 3 regions1. Prostatic urethra: passes through prostategland. Receives fluids from ejaculatory ductand prostate2. Membranous urethra: short region thatpasses through the pelvic floor
  18. 18. Urethra• Passageway for urine and semen• 3 regions1. Prostatic urethra: passes through prostategland. Receives fluids from ejaculatory ductand prostate2. Membranous urethra: short region thatpasses through the pelvic floor3. Spongy (penile) urethra: extends the length ofpenis and opens to outside
  19. 19. Penis• Male copulatory organ. Transfers sperm to thevagina
  20. 20. Penis• Male copulatory organ. Transfers sperm to thevagina• Parts: Root, shaft, glans (head)
  21. 21. Penis• Male copulatory organ. Transfers sperm to thevagina• Parts: Root, shaft, glans (head)• Contains erectile tissue that can becomeengorged with blood and become rigid
  22. 22. Accessory Glands: secrete fluids thatenter the urethra
  23. 23. Accessory Glands: secrete fluids thatenter the urethra• Seminal vesicles: glands posterior to urinarybladder. Produce viscous fluid that containsfructose, which serves as an energy source forsperm
  24. 24. Accessory Glands: secrete fluids thatenter the urethra• Seminal vesicles: glands posterior to urinarybladder. Produce viscous fluid that containsfructose, which serves as an energy source forsperm• Prostate: Walnut sized. Encircles the urethra.Produces thin, milky, alkaline fluid thatenhances the motility of sperm
  25. 25. Accessory Glands:• Seminal vesicles: glands posterior to urinarybladder. Produce viscous fluid that containsfructose, which serves as an energy source forsperm• Prostate: Walnut sized. Encircles the urethra.Produces thin, milky, alkaline fluid thatenhances the motility of sperm• Bulbourethral gland: pea sized. Produces pre-ejaculatory fluid, which provides lubricationand works as a buffer to prevent chemicalreaction between acidic urine and basicsemen
  26. 26. Semen• Slightly alkaline (pH = 7.5)
  27. 27. Semen• Slightly alkaline (pH = 7.5)• 60% of volume comes from seminal vesicles,40% from prostate, <1% from sperm andbulbourethral glands
  28. 28. Semen• Slightly alkaline (pH = 7.5)• 60% of volume comes from seminal vesicles,40% from prostate, <1% from sperm andbulbourethral glands• Contains 50 – 150 million sperm per mililiter

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