In medicine, agenesis refers to the failure of an organ to develop during embryonic growth and development. Many forms of agenesis are referred to by individual names, depending on the organ affected: , Agenesis of the corpus callosum- failure of the Corpus callosum to develop. , Renal agenesis- failure of one or both of the kidneys to develop. , Phocomelia- failure of the arms or legs to develop. , Penile...