Anatomy of the Testes
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Questions and Answers

What is the primary function of the scrotum in relation to the testes?

  • To provide nutrition to germ cells
  • To regulate testicular temperature (correct)
  • To synthesize androgens
  • To produce sperm

    • Which cell type provides nutrition to the male germ cells?

  • Sertoli cells (correct)
  • Male germ cells
  • Interstitial cells
  • Leydig cells

    • What is the approximate temperature difference between the testicular temperature and the normal internal body temperature?

  • 5–7°C lower
  • 2–2.5°C lower (correct)
  • 10–12°C lower
  • 1–1.5°C lower

    • What is the function of Leydig cells?

    <p>To synthesize and secrete androgens</p> Signup and view all the answers

    What is the name of the structure through which the seminiferous tubules of the testis open into the vasa efferentia?

    <p>Rete testis</p> Signup and view all the answers

    What is the approximate length of each testis in adults?

    <p>4 to 5 cm</p> Signup and view all the answers

    What is the name of the cells that undergo meiotic divisions to form sperm?

    <p>Spermatogonia</p> Signup and view all the answers

    How many compartments are present in each testis?

    <p>250</p> Signup and view all the answers

    What is the location of the epididymis?

    <p>Along the posterior surface of each testis</p> Signup and view all the answers

    What is the function of the seminiferous tubules?

    <p>To produce sperm</p> Signup and view all the answers

    What is the name of the hormones synthesized and secreted by Leydig cells?

    <p>Androgens</p> Signup and view all the answers

    What is the shape of each testis in adults?

    <p>Oval</p> Signup and view all the answers

    What is the name of the structure that contains small blood vessels and interstitial cells?

    <p>Interstitial spaces</p> Signup and view all the answers

    What is the number of seminiferous tubules present in each testicular lobule?

    <p>One to three</p> Signup and view all the answers

    What is the name of the duct that connects the epididymis to the other male reproductive organs?

    <p>Vas deferens</p> Signup and view all the answers

    Study Notes

    Testes Structure and Function

    • The testes are situated outside the abdominal cavity within a pouch called scrotum, which maintains a low temperature (2-2.5°C lower than normal internal body temperature) necessary for spermatogenesis.
    • Each testis is oval in shape, with a length of about 4-5 cm and a width of about 2-3 cm.
    • The testis is covered by a dense covering and has about 250 compartments called testicular lobules.

    Testicular Lobules

    • Each lobule contains one to three highly coiled seminiferous tubules where sperms are produced.
    • The seminiferous tubules are lined on the inside by two types of cells: male germ cells (spermatogonia) and Sertoli cells.
    • Male germ cells undergo meiotic divisions, leading to sperm formation, while Sertoli cells provide nutrition to the germ cells.

    Interstitial Spaces

    • The regions outside the seminiferous tubules are called interstitial spaces, containing small blood vessels and interstitial cells or Leydig cells.
    • Leydig cells synthesize and secrete testicular hormones called androgens.

    Male Sex Accessory Ducts

    • The male sex accessory ducts include rete testis, vasa efferentia, epididymis, and vas deferens.
    • The seminiferous tubules of the testis open into the vasa efferentia through rete testis.
    • The vasa efferentia leave the testis and open into the epididymis located along the posterior surface of each testis.
    • The epididymis leads to vas deferens, which ascends to the abdomen and loops over the urinary bladder.
    • The vas deferens receives a duct from the seminal vesicle and opens into the urethra as the ejaculatory duct.

    Urethra

    • The urethra originates from the urinary bladder and extends through the penis to its external opening called urethral meatus.
    • The urethra is responsible for transporting sperms from the testis to the outside.

    Testes Structure and Function

    • The testes are situated outside the abdominal cavity within a pouch called scrotum, which maintains a low temperature (2-2.5°C lower than normal internal body temperature) necessary for spermatogenesis.
    • Each testis is oval in shape, with a length of about 4-5 cm and a width of about 2-3 cm.
    • The testis is covered by a dense covering and has about 250 compartments called testicular lobules.

    Testicular Lobules

    • Each lobule contains one to three highly coiled seminiferous tubules where sperms are produced.
    • The seminiferous tubules are lined on the inside by two types of cells: male germ cells (spermatogonia) and Sertoli cells.
    • Male germ cells undergo meiotic divisions, leading to sperm formation, while Sertoli cells provide nutrition to the germ cells.

    Interstitial Spaces

    • The regions outside the seminiferous tubules are called interstitial spaces, containing small blood vessels and interstitial cells or Leydig cells.
    • Leydig cells synthesize and secrete testicular hormones called androgens.

    Male Sex Accessory Ducts

    • The male sex accessory ducts include rete testis, vasa efferentia, epididymis, and vas deferens.
    • The seminiferous tubules of the testis open into the vasa efferentia through rete testis.
    • The vasa efferentia leave the testis and open into the epididymis located along the posterior surface of each testis.
    • The epididymis leads to vas deferens, which ascends to the abdomen and loops over the urinary bladder.
    • The vas deferens receives a duct from the seminal vesicle and opens into the urethra as the ejaculatory duct.

    Urethra

    • The urethra originates from the urinary bladder and extends through the penis to its external opening called urethral meatus.
    • The urethra is responsible for transporting sperms from the testis to the outside.

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    Learn about the structure and function of the testes, including their location, shape, and internal compartments.

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