28_LectureOutline

28_LectureOutline - Structures of the Reproductive System...

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Unformatted text preview: Structures of the Reproductive System Gonads : organs that produce gametes and hormones Ducts: receive and transport gametes Accessory glands: secrete fluids into ducts Perineal structures: collectively known as external genitalia The Reproductive Tract Includes all chambers and passageways that connect ducts to the exterior of the body Male and Female Reproductive Systems Are functionally different Female produces one gamete per month Retains and nurtures zygote Male disseminates large quantities of gametes Produces 1/2 billion sperm per day The Male Reproductive System Testes or male gonads Secrete male sex hormones (androgens) Produce male gametes (spermatozoa or sperm) The Female Reproductive System Ovaries or female gonads Release one immature gamete ( oocyte ) per month Produce hormones Uterine tubes Carry oocytes to uterus: – if sperm reaches oocyte, fertilization is initiated and oocyte matures into ovum Uterus Encloses and supports developing embryo Vagina Connects uterus with exterior Male Reproductive Functions Pathway of Spermatozoa Testis Epididymis Ductus deferens (vas deferens) Ejaculatory duct Urethra Accessory Organs Secrete fluids into ejaculatory ducts and urethra Seminal glands (vesicles) Prostate gland Bulbo-urethral glands External Genitalia Scrotum Encloses testes Penis Erectile organ Contains distal portion of urethra The Testes Egg shaped 5 cm long, 3 cm wide, 2.5 cm thick (2 in. x 1.2 in. x 1 in.) Weighs 10–15 g (0.35-0.53 oz) Hangs in scrotum The Scrotum Is a fleshy pouch Suspended inferior to perineum Anterior to anus Posterior to base of penis Descent of the Testes Testes form inside body cavity Are adjacent to kidneys Gubernaculum testis Is a bundle of connective tissue fibers Extends from testis to pockets of peritoneum Locks testes in position (near anterior abdominal wall) as fetus grows During seventh month Fetus grows rapidly Circulating hormones Stimulate contraction of gubernaculum testis Each testis Moves through abdominal musculature Is accompanied by pockets of peritoneal cavity Accessory Structures Accompany testis during descent Form body of spermatic cord Ductus deferens Testicular blood vessels, nerves, and lymphatic vessels The Spermatic Cords Extend between abdominopelvic cavity and testes Consist of layers of fascia and muscle Enclose ductus deferens, blood vessels, nerves, and lymphatic vessels of testes Pass through inguinal canal Are passageways through abdominal musculature Form during development as testes descend into scrotum Descend into scrotum Deferential artery Testicular artery Pampiniform plexus of testicular vein Nerves of Testes Branches of genitofemoral nerve...
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This note was uploaded on 12/29/2011 for the course BIOLOGY 24011 taught by Professor Pan during the Fall '11 term at HCCS.

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28_LectureOutline - Structures of the Reproductive System...

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