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Amelia (birth defect)
Amelia (from Greek ἀ- "lack of" plus μέλος (plural: μέλεα or μέλη) "limb") is the birth defect of lacking one or more limbs. It can also result in a shrunken or deformed limb. For example, a child might be born without an elbow or forearm. The term may be modified to indicate the number of legs or arms missing at birth, such as tetra-amelia for the absence of all four limbs. A related term is meromelia, which is the partial absence of a limb or limbs.〔http://www.healthline.com/galecontent/amelia?print=true〕
==Causes==
The complete absence of an arm or leg in amelia occurs as a result of the limb formation process being either prevented or interrupted very early in the developing embryo: between 24 and 36 days following fertilization.〔 Tetra-amelia syndrome appears to have an autosomal recessive pattern of inheritance - that is, the parents of an individual with tetra-amelia syndrome each carry one copy of the mutated gene, but do not show signs and symptoms of the condition.〔http://ghr.nlm.nih.gov/condition/tetra-amelia-syndrome〕 In a few cases, amelia may be attributed to health complications during the early stages of pregnancy, including infection, failed abortion or complications associated with removal of an IUD after pregnancy, or use of Thalidomide.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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