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Reproductive System. Male Reproductive System. Formation of Sperm Cells. Spermatogenesis – sperm production. 4 sperm cells result from meiosis of a primary spermatocyte . Spermiogenesis – process of sperm cell maturation. Sperm cell parts: Head Contains the nucleus with 23 chromosomes

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reproductive system

Reproductive System

Male Reproductive System

formation of sperm cells
Formation of Sperm Cells
  • Spermatogenesis – sperm production. 4 sperm cells result from meiosis of a primary spermatocyte.
  • Spermiogenesis– process of sperm cell maturation.
  • Sperm cell parts:
    • Head
      • Contains the nucleus with 23 chromosomes
    • Midpiece
    • tail
organs of the male reproductive system
Organs of the Male Reproductive System
  • Testes
    • Must descend (inguinal canal) in order to lower temperature for sperm production
    • Undescended testes cannot produce sperm cells

*testes produce sperm cells and male sex hormones.

structure of testes
Structure of Testes
  • Lobules separated by connective tissue
  • Filled with seminiferous tubules
  • Seminiferous tubules contain undifferentiated cells that give rise to sperm cells
  • Interstitial cells produce male sex hormones and are located between the seminiferous tubules.
male internal accessory organs
Male Internal Accessory Organs
  • Epididymus
    • Located on the outside of the testis and leads to the ductusdeferentia
  • Ductusdeferentia
    • Muscular tube
    • Forms part of the spermatic cord
  • Seminal vesicles
    • Saclike structure attached to the ductus deferens
      • Secretes alkaline fluid that contains nutrients such as fructose that is added to sperm cells entering the ejaculatory duct.
  • Prostate gland
    • Surrounds the urethra just below the urinary bladder
    • Secretes thin, milky fluid which enhances sperm mobility and neutralizes the fluid containing the sperm cells and acidic secretions of the vagina.
  • Bulbourethral glands
    • Two small structures inferior to the prostate gland that secrete a fluid that lubricates the penis in preparation for sexual intercourse
  • Semen
    • Sperm cells and secretions of seminal vesicles, prostate gland, and bulbourethral glands.
    • Sperm cells in semen swim, but cannot fertilize the egg cell until they enter the female reproductive tract.
external reproductive organs
External Reproductive Organs
  • Scrotum
    • Pouch of skin and subcutaneous tissue that encloses the testes.
  • Penis
    • Conveys urine and semen
    • Becomes erect for insertion into the vagina during sexual intercourse
    • Body is composed of 3 columns of erectile tissue surrounded by connective tissue
    • Root of the penis is attached to the pelvic arch and membranes of the perineum.
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