anencefalea 31
anencefalea = anencefaliaLa anencephaly is a defect in the fusion of several sites of closure of the neural tube ( 2 for the merocraneo and the 2 and 4 for the 41 holocraneo; in the process of neurulation during embryogenesis. It occurs when the brain end or head of the neural tube fails to close, usually between the 23rd and the 26th day of pregnancy, resulting in a congenital cerebral malformation characterized by the partial or complete absence of the brain, skull, and scalp.