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By: Katherine Brind'Amour | Published: Jun 04, 2008

Amniocentesis is a test used for prenatal diagnosis of inherited diseases, Rh incompatibility, neural tube defects, and lung maturity. Normally…

By: Katherine Brind'Amour | Published: Jan 21, 2009

Chorionic villus sampling (CVS) is a test used for prenatal diagnosis. Safe to perform at an earlier stage in pregnancy than amniocentesis, CVS is…

By: Benjamin Garcia, Katherine Brind'Amour | Published: Nov 01, 2007

Wilhelm August Oscar Hertwig contributed to embryology through his studies of cells in development and his discovery that only one spermatozoon is…