The second meiotic division in the egg is completed before fertilization occurs. Capacitation of the sperm is completed in the female reproductive tract. The second meiotic division of the ovum is only completed once the ovum has been successfully penetrated by a spermatozoon. The acrosomal reaction results in the release of enzymes necessary for sperm penetration of the corona radiata and zona pellucida. Fertilization normally occurs in the uterus.
Fertilization results in the re-establishment of the diploid number of chromosomes.
The male and female pronuclei contain the haploid number of chromosomes. Secretory products of the uterine tube epithelial cells aid in the nourishment of the fertilized egg. B. Fertilization normally occurs in the ampulla of the fallopian tube. Extensive venous sinusoid spaces and numerous lymphocytes and neutrophils in the lamina propria. Stratified squamous epithelial lining.