Male Reproductive Anatomy Ppt

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DesLee26
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193575
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Male Reproductive Anatomy Ppt
Updated:
2013-01-18 15:38:18
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BIO 220
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Human Reproduction: Male Parts
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  1. What are the accessory structures of the male reproductive system?
    • epididymis
    • vas deferens
    • ejaculatory duct
    • Glands (Seminal vesicles, prostate, Cowper's)
  2. What are the gonads of the male reproductive system?
    testes
  3. What are the external genitalia of the male reproductive system?
    penis/ urethra
  4. Explain the structure of the:
    testes.
    1) located in sac of skin called the scrotum
  5. Explain the relation between the testes and the temperature.
    located outside the body due to cooler temperatures. Sperm cannot live in hot environments. THis leads to a decline of fertility rate.
  6. Explain the structure of the:
    scrotum.
    • 1) sac of skin different than other skin
    • 2) no adipose because adipose insulates; and, we don't want to insulate the testes
  7. Explain testicular displacement?
    in humans, the testes are permanently outward; however, there may be instances when the testes are moved to another place other than the scrotum
  8. Explain testicular dropping.
    • In humans, it is permanent. If the testes do not drop, they usually wait until the child is one or, if they must, wait until puberty. If still not dropped, the male is usually sterile in the testis that doesn't drop. Can be both or one. This is called cryptorchism.
    • In animals, some animals exhibit behavior where the testes only come out during reproduction.
  9. Explain the structure of the:
    tunica albuginea
    • 1) outer layer of testes
    • 2) tough connective tissue covering of the testes
  10. Explain the function of the tunica albuginea.
    When the testes are forming, some tunica goes inside and makes partitions (septa), dividing the testes into compartments, called lobules.
  11. Explain the structure of the:
    compartments (lobules)
    In each compartment, there are a number of seminiferous tubules.
  12. Explain the structure of the:
    seminiferous tubules
    • highly coiled tubes except at the end, which is straight.
    • End of each seminiferous tubule joins a network of tubes called the rete testis.
  13. Explain the structure of the:
    rete testis
    series of tubes within the testes that allow sperm to exit and push them to the next structure
  14. Explain the wall of the seminiferous tubules.
    • The wall is made up of two types of cells: cells in stages of sperm development and Sertoli cells.
    • In the middle is a lumen.
    • The space open to the lumen is the lumenal surface, where sperm is lodged in.
    • The outer wall has the least developed cells on the bottom. As they mature, they get pushed out.
  15. Explain the sperm cell in the seminiferous tubules.
    Near the outer wall, the least developed sperm cells are on the bottom. During development, they are pushed outward, where they become sperm. The sperm is then around the luminal surface until they get pushed out. At this point, they are not yet motile. They do not gain motility in the testes.
  16. Explain the Sertoli cells in the seminiferous tubules.
    • This cell is extremely important and intimately associated with the sperm.
    • It helps nourish adn provide other substances that play a role in the sperm's development that is necessary for male gamete formation. For example, it plays a part in hormones.
    • It also plays a role in moving the various sperm stages through the wall.
  17. The most prevalent cell in the seminiferous tubules is the:
    The one that is extremely important is the:
    • sperm cell
    • Sertoli
  18. Cells outside the Seminiferous tubules but located still inside the compartments are:
    interstitial cells of Leydig
  19. Explain the function of Leydig cells.
    produce testosterone, which is necessary for gamete formation
  20. Explain the structure of the:
    epididymis
    • highly coiled tube that sits atop the testes
    • it is also located in the scrotal sac due to its function.
  21. Explain the function of the epidydimis.
    • 1) Storage of sperm (resides until its ready to be ejaculated. This is its place of residence because it has a lower body temperature
    • 2) site where sperm gain motility. They have to spend a certain amount of time here to get motile. Afterwards, they move fairly quickly through the rest of the body.
  22. Explain the structure of the:
    Vas (Ductus) Deferins
    Straight tube that leads from the epidydimis into the seminal vesicle
  23. Explain the structure of the:
    seminal vesicle
    reproductive glands that produce a yellowish liquid high in fructose
  24. Explain the function of the: 
    fluid of the seminal vesicles.
    function is that its nutrients nourish the sperm and provide energy through ATP, which has to be produced to enable flagellas to move
  25. __  of semen is seminal fluid. 
    70%
  26. Which structures are paired?
    • testes
    • epidydimis
    • vas deferins
    • seminal vesicals
  27. From the seminal vesicle, __ and __ leave the __ through the __, which joins the __.
    • the seminal vesicle
    • seminal fluid
    • sperm
    • seminal vesicle
    • ejaculatory ducts
    • urethra
  28. Explain the structure of the:
    prostate gland
    • single gland under the urinary bladder;
    • has series of little ducts leading right into the urethra
  29. Explin the function of the:
    prostate gland
    • 1) Secretes a milky, alkaline secretion that helps neutralize acidity of the sperm environment, which is acidic due to the production of ATP in the Citric Acid Cycle and the production of acid.
    • 2) Only about 25% of the semen is from the prostate
  30. Explain the structure of the Cowper's Glands (Bolbourethra).
    has a duct that releases into the urethra
  31. Explain the funciton of the Bulbourethra
    secretes mucus, which provides a coating; reduces acidity of the vaginal tract; lubricates the tip of the penis for intercourse
  32. Explain the structure of the urethra.
    • single tube that is part of the urinary system.
    • In the male body, it is also used by the reproductive system
    • Leads from the urinary bladder to the outside of the body
  33. Explain the function of the urethra.
    Transports urine and semen, but not simultaneously
  34. Explain the structure of the penis.
    • copulatory organ made mostly of erectile tissue
    • Has3 columns with the urethra running in the center column (Corpus Spongiosum) and the other two made of erectile tissue, where blood vessels enable blood to pass, causing an erection. When the erection is over, it becomes flaccid.
  35. Explain the makeup of semen.
    • Sperm (4-5%) (200-500 mil. per ejaculation)
    • Seminal Vesicle Fluid (70%)
    • Prostate Fluid (25%)
    • Cowper's (1%)
  36. During ejaculation, how many mm of fluid are released?
    2 mm

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