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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 agenesis- failure of penis to develop
• Müllerian agenesis - failure of the uterus and part of the vagina to develop
• Eye agenesis - failure of the eyes to develop.
• Ear agenesis - failure of the ears to develop.