Ch23 Reproductive System

Ch23 Reproductive System - 1 Reproductive System...

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Unformatted text preview: 1 Reproductive System Reproductive System Reproductive Cells (Gametes) Reproductive Cells (Gametes) s Gametes (sex cells) = specialized reproductive cells s produced by meiosis s haploid (1n) = ½ # of chromosomes as somatic cells (23) s Male gametes= spermatozoa/sperms s singular = spermatozoon s Female gametes= ova/eggs s singular = ovum s Zygote = a cell formed from an ovum + a sperm Reproductive Organs Reproductive Organs s Primary reproductive organs = gonads (sex glands) s Males = Testes s Females = Ovaries s Secondary (accessory) organs: s ducts : transport sperms & ova s exocrine glands : nourish & support the gametes Embryonic Development Embryonic Development s At 5-6 weeks the sexes are undifferentiated Embryonic Development Embryonic Development s External genitals develop from the same embryonic structures s Internal genital ducts develop from separate embryonic structures s Wolffian ducts f male’s rete testis, efferent ducts, epididymis, vas deferens , seminal vesicle & prostate s Mullerian ducts f female’s vagina, cervix, uterus, & fallopian tubes s Ducts which are not used degenerate Male Reproductive System Male Reproductive System 2 Male Reproductive System Male Reproductive System s Primary organs = the testes s Secondary/Accessory organs s Internal secondary organs s Epididymis (paired) s Ductus/vas deferens (paired) s Ejaculatory urethra s Seminal vesicles (paired) s Prostate gland (one) s Bulbourethral glands (paired) s External secondary organs s Scrotum s Penis ducts glands s Testes descend into the scrotum 1-2 months before birth s They pass through the inguinal canal guided by a fibromuscular cord, the gubernaculum s a guide to keep the inguinal passage open as testes descend s Testes must descend completely to function properly Descend of the Testes Descend of the Testes The Testes The Testes The Testes The Testes s Suspended outside the body in a sac, the scrotum s temp. of testes must be kept ~ 3 Cº below body temperature for sperm survival s Functions: s Exocrine function f sperm production s Endocrine function f testosterone production The Testes The Testes s Suspended by a spermatic cord which contains: s the vas deferens/ductus deferens, blood vessels, lymphatic vessels, and nerves s a heat control system of veins which absorb heat from incoming arteries & radiates it away from the testes , which helps maintain the optimum temp. for sperm production The Testes The Testes s Tunica albuginea: s a fibrous capsule surrounding each testis s Septa : s capsule extensions dividing the testis into lobules s Each lobule has 1-4 tightly coiled seminiferous tubules 3 The Testes The Testes s Seminiferous tubules: s sperm-forming factories s Rete testis s set of tubules at one side of the testis s Seminiferous tubules empty sperms f rete testis Cells of the Seminiferous Tubules Cells of the Seminiferous Tubules s Interstitial/ Leydig cells : between seminiferous tubules s produce testosterone s Spermatogonia : line outside walls...
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This note was uploaded on 05/04/2008 for the course HP 320 taught by Professor Islam during the Spring '08 term at USC.

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Ch23 Reproductive System - 1 Reproductive System...

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