Structure of the sperm and eggpolarbodysecondaryMidpiedToocytezonapellucidaSpermEgg1Acrosome;2Nucleus:3Proximalcentriole;DA:Head;B:Neck; C:Midpiece;D.Principal piece; E:End piece
Structure of the sperm and egg Sperm 1 Acrosome；2 Nucleus；3 Proximal centriole； A: Head；B: Neck；C: Midpiece；D: Principal piece；E: End piece Egg
Step 1-CapacitationPhase1CapacitationPenetrationofPhase2corona radiataRecognitionandPenetrationofzonapellucid0OEjaculationAcrosome?SpermnucleusPlasmamembrane?0ActivationMembranefusionandentryPhase3
Capacitation Ejaculation Step 1-Capacitation Activation
Capacitation:A process of the spermatozoa obtaining capacityof fertilizing an ovum. (Site: uterus, oviduct)Mechanism: Removing Glycoprotein coat from the plasmamembraneoftheacrosomalregion.NotCapacitatedCapacitatedHyperactiviated1Triggers the acrosome reaction
A process of the spermatozoa obtaining capacity of fertilizing an ovum. (Site: uterus, oviduct) Mechanism: Removing Glycoprotein coat from the plasma membrane of the acrosomal region. Capacitation: Hyperactiviated Triggers the acrosome reaction
Step 2-Sperm-Zona Pellucida BindingA receptor-ligand interaction with a high degreeof species specificitySEMimages showing thebinding ofspermto the Zona Pellucida
A receptor-ligand interaction with a high degree of species specificity. Step 2 -Sperm-Zona Pellucida Binding SEM images showing the binding of sperm to the Zona Pellucida
Step3-AcrosomereactionRelease of enzymes (hyaluronidase) from acrosome.prividing the sperm with a enzyme drill to getthrough the zona pellucida. Losing acrosome before meeting the oocyte are unable tobind to the zona pellucida and thereby fertilization
Release of enzymes (hyaluronidase) from acrosome. prividing the sperm with a enzyme drill to get through the zona pellucida. Step 3-Acrosome reaction ※ Losing acrosome before meeting the oocyte are unable to bind to the zona pellucida and thereby fertilization