cortical reaction

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• Cortical reaction — Human ovum. The zona pellucida is seen as a thick clear girdle surrounded by the cells of the Corona radiata. Gray s …   Wikipedia

• reaction — 1. The response of a muscle or other living tissue or organism to a stimulus. 2. The color change effected in litmus and certain other organic pigments by contact with substances such as acids or alkalies; also the property that such substances… …   Medical dictionary

• Acrosome reaction — During fertilization, the acrosome reaction is the reaction which occurs in the acrosome of the sperm as it approaches the egg. The acrosome is a cap like structure over the anterior half of the sperm s head.As the sperm approaches the zona… …   Wikipedia

• Homologation reaction — A homologation reaction, also known as homologization, is any chemical reaction that effects an overall increase of the carbon skeleton of a saturated reactant molecule. [ Encyclopedia of Inorganic Chemistry DOI|10.1002/0470862106.id396] The… …   Wikipedia

• Shwartzman reaction generalized — a generalized reaction following two intravenous injections of endotoxin separated by 24 hours; it is characterized by widespread hemorrhages, bilateral cortical necrosis of the kidneys, and a marked fall in leukocyte and platelet counts and… …   Medical dictionary

• Oocyte activation — Oocyte (or ovum/egg) activation is a series of processes that occur in the oocyte after fertilisation. Sperm entry causes calcium release into the oocyte. In mammals, this has been proposed to be caused by the introduction of phospholipase C… …   Wikipedia

• Human fertilization — is the union of a human egg and sperm, usually occurring in the ampulla of the fallopian tube. It is also the initiation of prenatal development.Fertilization constitutes the penetration of the oocyte (egg) which the sperm performs, fusion of the …   Wikipedia

• Cortex — (Latin: bark , rind , shell or husk ) may refer to: Contents 1 Sciences 2 Anatomy 2.1 Organs 2.1.1 The brain 3 …   Wikipedia

• Egg activation — After the fusion of the sperm plasma membrane and the egg plasma membrane after fertilization, animal eggs go through a process called egg activation to prepare the egg for development.There are three functions of egg activation: # Block to… …   Wikipedia

• Vitelline membrane — Infobox Embryology Name = Vitelline membrane Latin = m. vitellina GraySubject = 5 GrayPage = 45 Caption = Caption2 = System = CarnegieStage = Days = Precursor = GivesRiseTo = MeshName = Vitelline+membrane MeshNumber = A16.631.886 DorlandsPre = m… …   Wikipedia

• Polyspermy — In biology, polyspermy describes an egg that has been fertilized by more than one sperm. Diploid organisms normally contain two copies of each chromosome, one from each parent. The cell resulting from polyspermy, on the other hand, contains three …   Wikipedia