Male Reproductive System Anatomy
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Questions and Answers

What is the average diameter of seminiferous tubules in the testis?

  • 50-100 micrometers
  • 250-300 micrometers
  • 100-200 micrometers
  • 200-250 micrometers (correct)

    • Which cells secrete androgens in the testis?

  • Myoid cells
  • Interstitial cells (correct)
  • Sertoli cells
  • Fibroblasts

    • What type of cells physically and metabolically support developing sperm precursors in the testis?

  • Myoid cells
  • Fibroblasts
  • Sertoli cells (correct)
  • Interstitial cells

    • How do myoid cells in the testis contribute to sperm movement?

    <p>Allowing weak contractions of tubules</p> Signup and view all the answers

    Where does sperm travel to from the rete testis in the testis anatomy?

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

    What is the main function of Leydig cells in the testes?

    <p>Secrete testosterone</p> Signup and view all the answers

    What is the primary function of the pampiniform plexus surrounding the testicular artery?

    <p>Regulate temperature within the scrotal sac</p> Signup and view all the answers

    What role does the dartos muscle play in maintaining testicular temperature?

    <p>Controlling temperature by moving testes away from the body</p> Signup and view all the answers

    Which structure is responsible for covering the anterior and lateral sides of the testes?

    <p>Tunica vaginalis</p> Signup and view all the answers

    What is the failure of the testes to descend into the scrotum known as?

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

    What triggers the secretion of testosterone by Leydig cells?

    <p>Pituitary gonadotropin</p> Signup and view all the answers

    Which organelles are involved in the synthesis of testosterone in Leydig cells?

    <p>Smooth ER and mitochondria</p> Signup and view all the answers

    What is the function of Leydig cells in the male reproductive system?

    <p>Promote development of primary male sex characteristics</p> Signup and view all the answers

    When do Leydig cells begin synthesizing testosterone?

    <p>At puberty</p> Signup and view all the answers

    What happens to fetal interstitial cells during late pregnancy?

    <p>They regress and become quiescent</p> Signup and view all the answers

    What is the role of transferrin in the testis?

    <p>Protect spermatogenic cells from circulating immune components</p> Signup and view all the answers

    Which of the following statements about androgen-binding protein is true?

    <p>It concentrates testosterone for spermiogenesis</p> Signup and view all the answers

    What feedback mechanism does inhibin play a role in within the testis?

    <p>Suppressing FSH synthesis and release</p> Signup and view all the answers

    During spermiogenesis, what happens to excess cytoplasm shed by developing sperm cells?

    <p>It undergoes phagocytosis by Sertoli cells</p> Signup and view all the answers

    What clinical condition can orchitis in the testis be usually secondary to?

    <p>Urinary tract infections (UTI)</p> Signup and view all the answers

    What is the role of the epididymis in the male reproductive system?

    <p>Short-term sperm storage and sperm maturation</p> Signup and view all the answers

    Which type of epithelium lines the duct of epididymis?

    <p>Pseudostratified columnar epithelium</p> Signup and view all the answers

    What is the function of the principal cells in the epididymis?

    <p>Remove water and residual bodies</p> Signup and view all the answers

    Which structure is continuous with the ductus deferens during ejaculation?

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

    In which region of the epididymis do sperm cells undergo further modifications?

    <p>Body region</p> Signup and view all the answers

    Which cells initially line the loops connecting the seminiferous tubules to the rete testis?

    <p>Sertoli cells</p> Signup and view all the answers

    What is the main function of non-ciliated cuboidal cells in the efferent ductules?

    <p>Absorption of fluid secreted by Sertoli cells</p> Signup and view all the answers

    What type of epithelium lines the efferent ductules closer to their connection to the duct of epididymis?

    <p>Simple cuboidal epithelium</p> Signup and view all the answers

    The rete testis is composed of interconnected channels lined with which type of epithelium?

    <p>Simple cuboidal epithelium</p> Signup and view all the answers

    What is the role of circular smooth muscle cells in the walls of the efferent ductules?

    <p>Assistance in moving sperm into the duct of epididymis</p> Signup and view all the answers

    What is a common feature of low sperm quality?

    <p>Low ejaculate volume and abnormal morphology</p> Signup and view all the answers

    Which cells divide the seminiferous tubules into basal and adluminal compartments?

    <p>Sertoli cells</p> Signup and view all the answers

    What is the function of the blood-testis barrier in the seminiferous epithelium?

    <p>Prevent autoimmune attacks against spermatogenic cells</p> Signup and view all the answers

    Where are spermatogonia located within the seminiferous tubules?

    <p>In the basal compartment</p> Signup and view all the answers

    What is the function of the Sertoli cells' extended surfaces in relation to spermatogenic cells?

    <p>Support physical and metabolic needs</p> Signup and view all the answers

    What is the main role of Sertoli cells within the seminiferous tubules?

    <p>Nourish and support spermatogenic cells</p> Signup and view all the answers

    Why are tight occluding junctions between basolateral Sertoli cell membranes significant?

    <p>They form the blood-testis barrier</p> Signup and view all the answers

    Which organelle is abundant in Sertoli cells and is involved in various cellular processes?

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

    What characterizes the nuclei of Sertoli cells?

    <p>Ovoid with euchromatin</p> Signup and view all the answers

    What is a key metabolic function of Sertoli cells in supporting germ cells?

    <p>Beta-oxidation of fatty acids</p> Signup and view all the answers

    Study Notes

    Testis Structure and Function

    • The average diameter of seminiferous tubules in the testis is 150-300 μm.
    • Leydig cells secrete androgens in the testis.
    • Sertoli cells physically and metabolically support developing sperm precursors in the testis.

    Sperm Movement and Development

    • Myoid cells in the testis contribute to sperm movement by contracting and relaxing to facilitate sperm transport.
    • Sperm travels from the rete testis to the epididymis in the testis anatomy.

    Leydig Cells

    • The main function of Leydig cells in the testes is to produce androgens, primarily testosterone.
    • The secretion of testosterone by Leydig cells is triggered by luteinizing hormone (LH).
    • Smooth endoplasmic reticulum and mitochondria are involved in the synthesis of testosterone in Leydig cells.
    • Leydig cells begin synthesizing testosterone during fetal development.
    • During late pregnancy, fetal interstitial cells differentiate into Leydig cells.

    Pampiniform Plexus and Dartos Muscle

    • The primary function of the pampiniform plexus surrounding the testicular artery is to regulate testicular temperature.
    • The dartos muscle plays a role in maintaining testicular temperature by contracting and relaxing to adjust scrotal skin.

    Testicular Anatomy

    • The tunica vaginalis is responsible for covering the anterior and lateral sides of the testes.
    • The failure of the testes to descend into the scrotum is known as cryptorchidism.

    Epididymis and Sperm Maturation

    • The role of the epididymis in the male reproductive system is to store, mature, and transport sperm.
    • The duct of epididymis is lined with pseudostratified epithelium.
    • Principal cells in the epididymis are involved in the transport of sperm and the absorption of excess fluids.
    • The ductus deferens is continuous with the duct of epididymis during ejaculation.
    • Sperm cells undergo further modifications in the corpus epididymis.

    Efferent Ductules and Rete Testis

    • The efferent ductules are initially lined by ciliated cuboidal cells.
    • The main function of non-ciliated cuboidal cells in the efferent ductules is to absorb excess fluids.
    • The efferent ductules closer to their connection to the duct of epididymis are lined with simple cuboidal epithelium.
    • The rete testis is composed of interconnected channels lined with simple cuboidal epithelium.
    • Circular smooth muscle cells in the walls of the efferent ductules help regulate fluid flow.

    Sperm Quality and Spermatogenesis

    • A common feature of low sperm quality is abnormal sperm morphology.
    • Spermatogonia are located near the basal lamina of the seminiferous tubules.

    Sertoli Cells and Blood-Testis Barrier

    • The blood-testis barrier in the seminiferous epithelium is formed by tight occluding junctions between basolateral Sertoli cell membranes.
    • Sertoli cells' extended surfaces are involved in phagocytosis and nutrient transport to support spermatogenic cells.
    • The main role of Sertoli cells within the seminiferous tubules is to support and nurture developing sperm cells.
    • Tight occluding junctions between basolateral Sertoli cell membranes are significant for maintaining the immunological barrier.
    • Abundant lysosomes in Sertoli cells are involved in various cellular processes.
    • Sertoli cells have characteristic tripartite nuclei.
    • A key metabolic function of Sertoli cells in supporting germ cells is to provide lactate and other nutrients.

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    male rep system.docx

    Description

    Explore the anatomy of the male reproductive system, focusing on structures like the duct of epididymis, ductus deferens, and urethra. Learn how sperm is transported from the scrotum to the penis during ejaculation, including the role of peristaltic contractions in the process.

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