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Reproductive System

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

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  1. Reproductive System Male Reproductive System

  2. 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

  3. 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.

  4. 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.

  5. 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.

  6. 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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