Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Upcoming SlideShare
Reproduction
Reproduction
Loading in …3
×
1 of 27

Gamete transport and fertilization

6

Share

Download to read offline

Complete presentation about gamete transport in male and female animal reproductive tract and fertilization

Related Books

Free with a 30 day trial from Scribd

See all

Related Audiobooks

Free with a 30 day trial from Scribd

See all

Gamete transport and fertilization

  1. 1. By: Dr. Arshaq Asfar
  2. 2. Oklahoma State University,2001
  3. 3.  Haploid sex cell (egg or sperm) which contains a single copy of each chromosome. (Cumulus oophorus)
  4. 4. Contd...
  5. 5.  Spermatozoa produced in testes in the seminiferous tubules.(Spermatogonia- Mitosis: spermatocytes, Meiosis: spermatids, Spermiogenesis )  From seminiferous tubules sperms are passed to afferent ducts.  Afferent ducts pass the sperm to rete testes.  From rete testes sperm leave the testes by efferent ducts.  Efferent ducts deliver the sperm to the Epididymis- Caput, Corpus and Cauda.
  6. 6. Caput: Fluid concentration & Ist stage maturation. Corpus: Maturation completed. Cauda: Storage and Ejaculation (muscle layer) (Setchell & Brooks,1988)
  7. 7. Contd... Dacheux & Paquignon,1980
  8. 8.  Epididymis pass the sperms to the Vasa Deferentia.  From vasa deferentia sperms are passed to Ampulla.  Ampulla to Urethra. Accessory glands of male reproductive system:  Seminal vesicles  Prostate gland  Bulbourethral glands (F.H.Martini,2002)
  9. 9.  Ovulation (release of ova) occurs at any point of ovary except mare (ovulatory fossa) by rupture of graffian follicle.  FSH causes follicle growth.  At the begining of estrus Progesterone levels fall to minimum.  Estradiol reaches its highest cyclic values.  LH surge occurs prior to ovulation leads to ovulation. (Hafez & Hafez,2000)
  10. 10.  Egg pick up- oviduct curls over ovary to facilitate egg pickup by mucosal folds of fimbriae.  Ovum protrudes at the ovarian surface and is swept into the ostium of the oviduct by the action of motile kinocilia of the fimbriae.  Ova reaches to ampullary-isthmic junction.
  11. 11.  Spermatozoa deposited in female tract.  Survival time- 20-48hrs  Gamete transport due to inherent contractility of the female tract modified by CNS reflexes and hormones.  3 stages: i) Short,rapid sperm transport (2-30min) ii) Colonization of reserviors (cervical crypts) iii) Slow, prolonged release.  Sperm loss: i) Retrograde loss. ii) Phagocytosis and Acidic environment (pH-4). (Hafez & Hafez,2000)
  12. 12. (Blandau & Harper,1988)
  13. 13.  Cervix: sperm reservoir,protection from phagocytosis, filters defective and immobile sperms, provides sperm energy requirements. (J.R.Fertil,1973)  Uterus: Contractility of myometrium  Oviduct: Peristalsis & antiperistalsis, fluid currents & counter currents by ciliary action.
  14. 14.  Ovum in metaphase-II of 2nd meiotic division when ovulated (except dog). (King et al.,1987)  Sperm maturation: i) Capacitation *No change in sperm morphology *Motility change (hyperactivation) ii)Acrosome reaction (Chang & Austin,1951)
  15. 15. Capacitation process includes: (1) Removal of glycoprotein coat and seminal plasma proteins from surface. (2) Alteration in the flagellar motility that are necessary to penetrate the zona pellucida. (3) Development of the capacity to fuse with the plasma membrane of the oocyte.
  16. 16. cAMP Power output
  17. 17.  Fertilization include: i) Sperm migration between cumulus cells. ii) Sperm attachment and migration through zona pellucida. iii) Fusion of sperm & ovum plasma membranes. (Hafez & Hafez,2000)
  18. 18. (Merriam & Webster,2006)
  19. 19. Parameter Cattle Horse Sheep Swine 2 Cell (days) 1 1 1 0.6-0.8 4 Cell (days) 1.5 1.5 1.3 1 8 Cell (days) 3 3 1.5 2.5 Blastocyst transport to uterus (Days) 3-4 5.5-6 2.5-3 2 Early embryonic development (Hafez & Hafez,2000)

×