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Male Reproductive System

Male Reproductive System

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Male Reproductive System

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  1. Male Reproductive System Functions: 1. testes produce sperm and the male sex hormone testosterone 2. ducts transport, store and assist in maturation of the sperm 3. accessory organs secrete most of the liquid portion of the semen 4. the penis and urethra serve as a passageway for sperm and urine

  2. Male Reproductive System ejaculatory duct prostate gland seminal vesicle bladder urethra bulbourethral gland vas deferens penis epididymus glans penis testes scrotum

  3. Female Reproductive System Functions: 1. ovaries produce secondary oocytes and sex hormones 2. uterine tubes transports secondary oocyte to uterus for fertilization 3. uterus is site of implantation of fertilized ovum, development of fetus, and labor 4. vagina receives the penis during intercourse, passageway for childbirth 5. mammary glands synthesize, secrete, and eject milk

  4. Female Reproductive System Fimbria Fallopian Tube stratum basalis functionalis Prepuce

  5. Male : Female Homology MalesFemales Testes Ovaries Penis Vagina Glans Penis Clitoris Scrotum Labia Majora Foreskin Prepuce Prostate Gland Greater Vestibule Gland Seminal Vesicle Paraurethral Gland

  6. Male Puberty Changes • GnRH increase • LH/FSH increase • testosterone increase • spermatogenesis onset • genitalia increase • muscle/bone increase • hair growth increase • voice deepens • sweat increase

  7. Enticement, Excitement and Orgasm • 1. Enticement - Sympathetic Nervous System • Male/Female become sexually attracted to someone • show similar response as “Fight or Flight” response • 2. Excitement - Parasympathetic Nervous System • Male Erection: • arteries in the penis dilate and fill the spongy tissue with blood • Spongy tissue traps the blood in sinuses making the penis stay erect • Female Lubrication: • arteries in the vagina fill blood forcing lubricating fluid out • Secretions lubricate the vagina and prepare the genitals for intercourse • 3. Orgasm - Sympathetic Nervous System • Male Ejaculation: • peristaltic contractions propel semen through out of the penis • Female Orgasm: • peristaltic contractions ripple through the uterus and vagina

  8. Female Reproductive Cycle Hormones GnRH (gonadotropin releasing hormone) stimulates the anterior pituitary to release FSH and LH FSH (follicle stimulating hormone) stimulates the follicle growth and estrogen release LH (lutenizing hormone) stimulates the follicle growth and estrogen release promotes ovulation and triggers the formation of the corpus luteum Estrogens development and maintenance of female sex characteristics controls fluid and electrolyte balance and increases protein anabolism lowers blood cholesterol and moderate levels inhibit GnRH, LH and FSH Progesterone works with estrogens to prepare endometrium for implantation of ovum prepares mammary glands for milk secretion and inhibits the release of GnRH and LH

  9. Menstrual Cycle • Ovarian Cycle • Follicular phase • ovulation • luteal phase • Uterine Cycle • menstrual phase • proliferative phase • secretory phase

  10. Hormonal-Dependent Female Sexual Activity Sexual activity peaks at ovulation

  11. Development of Sexual Orientation • Genetics? • similarity in twins • runs in families • Brain Differences? • male/female • gay/straight • Hormones? • Environment? • increased maternal contact • lack of playmates • many older brothers

  12. Female Sexually Dimorphic Nuclei

  13. Male Sexually Dimorphic Nuclei

  14. Reproductive System Development • XY chromosomes • SRY genes • Wolffian Ducts • Mullerian Ducts

  15. Sex Hormones and Sexual Behavior in the Female rat

  16. Sex Hormones and Sexual Behavior in the Male rat

  17. Testosterone Myth