Male Reproductive System

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Presentation transcript:

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 Midpiece tail

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 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 Epididymus Located on the outside of the testis and leads to the ductus deferentia Ductus deferentia 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 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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