Chapter 28 - The Reproductive System

Chapter 28 The - Chapter 28 The Reproductive System Structures of the Reproductive System 0 Gonads: 1 Ducts: 2 Accessoryglands: 3

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Chapter 28 – The Reproductive System Structures of the Reproductive System 0. Gonads : organs that produce gametes and hormones 1. Ducts: receive and transport gametes 2. Accessory glands: secrete fluids into ducts 3. Perineal structures: collectively known as  external genitalia zygote; male releases large #’s of gametes: produce 1/2 billion sperm/day Male: Testes Female: Ovaries  release 1 gamete ( oocyte )/month & produce hormones; uterine tubes carry oocytes to uterus; fertilization  is initiated if sperm gets to oocyte, then matures into  ovum Pathway of   Spermatozoa :  Testis     Epididymis     Ductus deferens (vas deferens)     Ejaculatory duct     Urethra;  Accessory Organs : secrete fluids into ejaculatory ducts & urethra; Seminal glands (vesicles), Prostate gland & Bulbo- urethral glands External Genitalia: Scrotum Penis  contains distal portion of urethra Descent of Testes: Testes form inside body cavity; adjacent to kidneys Gubernaculum testis: position as fetus grows 7th month   fetus grows rapidly, circulating hormones stimulate contraction of gubernaculum testis; testis moves through  Accessory Structures spermatic cord: ductus deferens, testicular blood  Spermatic Cords  extend between abdominopelvic cavity & testes; pass through  inguinal canal; forms as testes descends  to scrotum Blood Vessels Pampiniform plexus  of testicular vein Male Inguinal Hernias : protrusions of visceral tissues into inguinal canal; spermatic cord (in closed inguinal canal) causes  weak point in abdominal wall  Tunica Vaginalis: serous membrane lines scrotal cavity;   friction; parietal visceral layers Dartos Muscle : layer of smooth muscle in scrotum; causes wrinkling of scrotal surface, while  Cremaster Muscle is a  Temperature Regulation: normal sperm development requires temperatures 1.1°C (2°F)   compared to body temp; muscles  relax/contract to move testes  / ; maintaining temperature Tunica Albuginea under tunica vaginalis; dense layer of CT rich in collagen fibers, continuous with fibers surrounding 
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This note was uploaded on 07/13/2011 for the course BIOL 2401 taught by Professor Watson during the Summer '10 term at Richland Community College.

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Chapter 28 The - Chapter 28 The Reproductive System Structures of the Reproductive System 0 Gonads: 1 Ducts: 2 Accessoryglands: 3

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