Function. Reproduction. General Reproductive System Organization. General Reproductive System Organization. Fertilization.
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1 Function Reproduction Chapter 20 Not for homeostasis of the individual person can survive indefinitely without a reproductive system Continuation of the species continuation of genes beyond the lifespan of a single individual General Reproductive System Organization Primary Reproductive Organs (Gonads) Testes (male) and Ovaries (female) 1. Produce gametes Sperm and Ova 2. Produce and secrete sex steroid hormones testosterone, estrogen and progesterone responsible for gamete development, development of reproductive tract and secondary sex characteristics General Reproductive System Organization Secondary Reproductive Organs reproductive tract tube connecting gametes to external environment accessory sex glands supportive secretions External Genitalia visible portions of reproductive tract sexual stimulation Gametogenesis Gametogenesis production of gametes Oogenesis (Ova production) Spermatogenesis (Sperm production) produced through meiosis pairs of homologous chromosomes split among daughter cells 23 chromosomes each Fertilization Fertilization union of gametes Two gametes fuse together combine genetic information of the parents Development from single cell to multicellular adult unique combination of genes 1
2 Hypothalamal/Pituitary Regulation of Reproduction Gonadotrophins - FSH and LH secreted by ant. pituitary Influence both male and female reproductive development and function: stimulate spermatogenesis/oogenesis stimulate gonadal hormone secretion maintain structure of gonads Release induced by GnRH from the hypothalamus low level secretion during childhood, increases markedly at onset of puberty Males vs. Females Gamete production Eggs released intermittently = 1mature egg/month Mature sperm are produced continuously Sex steroid release Female hormones have cyclical release Testosterone released continuously Duration of reproductive life Reproductive capability begins at puberty for both M and F Female reproduction ends during middle age (menopause) Male reproductive potential continues throughout life Testes Primary reproductive organ Produce Sperm Produce Testosterone Housed in Scrotum external to peritoneal cavity low temp. (35 C) needed for sperm prod. Testes Seminiferous Tubules (800 ) site of spermatogenesis Cell types: 1. Leydig cells Located in space between seminiferous tubules Produce Testosterone (steroid hormone) 2. Sertoli cells Large cells that line walls of seminiferous tubules Surround and support developing sperm: Provide nourishment Destroy defective sperm (phagocytosis) Secrete seminiferous tubule fluid Protect sperm from immune system Testes Testes 3. Spermatogenic cells: actively differentiate into mature sperm cells begins at onset of puberty Mature sperm released into lumen of tubule 64 days to complete normal male = 30 million/day 2
3 Spermatogenesis Mature Spermatozoa Sperm development and testosterone production under hormonal control LH Leydig cells testosterone FSH Sertoli cells spermatogenesis head chromosomes tail swimming midpiece mitochondria acrosome enzyme filled vesicle 'enzymatic drill' Male Reproductive Tract Epididymis storage of mature sperm Vas Deferens conduct sperm out of scrotum to urethra Ejaculatory Duct merger point of both vas deferens receives glandular secretions Urethra common channel for expulsion of semen and urine Male Accessory Glands Produce Seminal Fluid support sperm in female reprod. tract provide nutrients and lubricate tubules semen - seminal fluid + sperm Seminal Vesicles (60% of semen volume) supply fructose (energy), prostaglandins induce contractions in female repr. tract Male Accessory Glands Prostate Gland produces alkaline fluid neutralizes vaginal acidity Bulbourethral Glands Secrete lubricating fluid for sexual intercourse Penis Male copulatory organ Consists of erectile tissue spongy tissue with arterioles Constricted when flacid Dilate for erection Contains urethra Glans penis (enlarged end) emerges from prepuce (foreskin) 3
4 Ovaries Eggs (Ova) Female Sex Hormones: Estrogen (estradiol 17β) ova maturation and release secondary sex characteristics maintenance and maturation female reprod. tract Progesterone secondary sex characteristics promote fertilization of ovum prepare reproductive tract for pregnancy Secondary Sex Organs Female reproductive tract oviducts (Fallopian Tubes) Uterus Implantation/gestation Vagina copulation Connected to uterus at the cervix Sperm enters uterus via cervical canal External Genitalia Oogenesis labia majora labia minora clitoris germ cells (oogonia) arise early in embryonic development 6-7 million by 5th month of gestation production ceases, and most die off differentiate into primary oocytes near end of gestation contains 46 replicated chromosomes begin meiosis, but halt in initial stages Oogenesis At birth, ovaries contain ~ 2 million primary oocytes gradually lost (400,000 remain at puberty) primary oocytes surrounded by single layer of granulosa cells (ovarian follicle) One 1 oocyte matures and is released from its follicle each month About 400 total in lifetime, rest degenerate By menopause, few eggs remain Ovarian Cycle lasts ~28 days 2 alternating phases: Follicular phase (Day 1-14) 1 follicle develops with FSH stimulation 1 follicle - 1 oocyte w/ single granulosa layer 2 follicle - granulosa layer divides into numerous layers, fluid filled vesicles form mature (Graafian) follicle - vesicles merge to form fluid filled antrum 4
5 Ovarian Cycle Ovulation of mature egg Day 14 of ovarian cycle Luteal phase (Day 14-28) Presence of corpus luteum prepares reproductive tract for pregnancy Ovarian Follicle Oocyte Zona pellucida = gel-like membrane around oocyte Granulosa Cells = surround and support oocyte cells secrete Follicular Fluid into antrum containing estrogen Thecal cells specialized connective tissue cells secrete testosterone used by granulosa cells to make estrogen Oogenesis Egg completes 1st meiotic division just before ovulation releases 1st polar body to become a 2 oocyte begins 2nd meiotic division, but then stops not completed until fertilization Corpus Luteum Formation After egg is released follicle becomes corpus luteum secretes estrogen and progesterone build-up of uterus If egg is fertilized corpus luteum remain maintains uterine buildup If not, corpus luteum degenerates onset of new follicular phase Hormonal Regulation of Ovarian Cycle Under control of hypothalamus (GnRH) stimulates FSH and LH release from ant. pituitary 1 follicle begins to develop under stim. by FSH As follicle matures, estrogen (estradiol) secretion increases Hormonal Regulation of Ovarian Cycle As estrogen increases, positive feedback on the ant. pit. (stim LH prod) LH surge rapid increase in LH release on Day 13 follicle ruptures and releases the egg ovulation 5
6 Hormonal Regulation of Ovarian Cycle Cells of ruptured follicle form the Corpus Luteum secretes Estrogen and Progesterone help prepare uterus for a fertilized egg progesterone inhibits FSH and LH = no new follicles mature Hormonal Regulation of Ovarian Cycle If egg is fertilized corpus luteum is maintained halts development and release of a 2nd egg If egg is not fertilized corpus luteum degenerates within 2 weeks Uterine (Menstrual) Cycle E and P induce cyclical buildup and breakdown of uterine lining preparation for pregnancy on average occurs every 28 days in women Uterus consists of 3 layers: Perimetrium = outer later of connective tissue Myometrium = smooth muscle Endometrium = lining with many blood vessels, glands Uterine (Menstrual) Cycle Proliferative phase estrogen induced starts buildup of endometrium while follicle matures corresponds with later part of Follicular Phase (Days 5-14) lasts ~ 10 days Uterine (Menstrual) Cycle Secretory phase progesterone induced Completes buildup Increases # blood vessels and secretory glands engorged with glycogen for embryonic support Corresponds to Luteal Phase (Day 14-28) Uterine (Menstrual) Cycle Menstrual phase due to progesterone as corpus luteum degenerates discharge of blood and endometrial debris Fall in P, release uterine prostaglandin vasoconstriction and contraction corresponds with early Follicular Phase (Days 1-5) 6
7 Fertilization Occurs in oviduct of millions of sperm, only a few hundred reach oviduct sperm head entry triggers change in zona pellucida prevents other sperm from entering ovum completes 2nd meiotic division ejects 2nd polar body. sperm and egg nuclei fuse zygote Early Development zygote begins mitotic cell divisions (cleavage) hr after fertilization Forms blastocyst by Day 6 (hollow ball of cells) inner layer = inner cell mass (embryo) outer layer = chorion consists of trophoblast cells Implantation zygote enters uterus 3 days after fertilization blastocyst implants in endometrium on Day 6 blastocyst begins cell differentiation Embryo Fetus (8+ weeks) Implantation chorion of implanted embryo secretes Human Chorionic Gonadotropin (hcg) prevents degeneration of the corpus luteum through 3rd month of pregnancy maintains E and P production, thus endometrium Placenta develops from adjacent chorionic and endometrial tissue allows exchange between maternal and fetal blood performs functions urinary, digestive, respir. systems Hormonal production Other Extraembryonic Membranes Amniotic sac fluid filled cavity (amniotic fluid) Protects embryo Chorion outer membrane 7
8 Childbirth Hormonally driven Oxytocin peptide hormone from hypothalamus, stored in posterior pituitary induces strong uterine contractions expulsion of fetus affected by estrogen and progesterone secretion estrogen stimulates oxytocin secretion and # oxytocin receptors on myometrial cells progesterone reduces sensitivity of uterus to estrogen, oxytocin and prostaglandins Childbirth At term, estrogen levels placenta converts fetal adrenal androgens into estrogen labor begins when oxytocin reaches critical level Stages of labor Cervical dilation (10 cm) head of fetus pushes on cervix Fetal Expulsion Placental Expulsion 8
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