Dysgenesis

The term dysgenesis is used to describe abnormal organ development during embryo

Embryo

An embryo is a multicellular diploid eukaryote in its earliest stage of development, from the time of first cell division until birth, hatching, or germination...

nic growth and development. As opposed to agenesis

Agenesis

In medicine, agenesis refers to the failure of an organ to develop during embryonic growth and development due to the absence of primordial tissue...

, which refers to the complete failure of an organ

Organ (anatomy)

In biology, an organ is a collection of tissues joined in structural unit to serve a common function. Usually there is a main tissue and sporadic tissues . The main tissue is the one that is unique for the specific organ. For example, main tissue in the heart is the myocardium, while sporadic are...

 to develop, dysgenesis usually implies disordered development or malformation and in some cases represents the milder end of a spectrum of abnormalities.

Examples:

• Gonadal dysgenesis
  Gonadal dysgenesis
  Gonadal dysgenesis is a term used to describe multiple reproductive system development disorders. They are conditions of genetic origin. It is characterized by a progressive loss of primordial germ cells on the developing gonads of an embryo....
  
  
• Adrenal dysgenesis
• Thyroid dysgenesis
  Thyroid dysgenesis
  Thyroid agenesis is a cause of congenital hypothyroidism where the thyroid is missing, ectopic, or severely underdeveloped....
  
  
• Anterior segment dysgenesis
  Anterior segment dysgenesis
  Anterior segment dysgenesis is a failure of the normal development of the tissues of the anterior segment of the eye. It leads to anomalies in the structure of the mature anterior segment, associated with an increased risk of glaucoma and corneal opacity....