Cephalic Disorders

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Other Cephalic Disorders

Acephaly is usually associated with the development of a parasitic "twin" attached to an otherwise normal fetus, usually at the neck. The acephalic fetus has no head or heart and cannot survive independently; blood circulation comes from the heart of the otherwise normal "twin."


Exencephaly usually is found in embryos as an early stage of anencephaly. It is characterized by development of the brain outside the skull. In most cases, the brain tissue degenerates a...Read the full article