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Anencephaly is the absence of a major portion of the brain, skull, and scalp that occurs during embryonic development. [1] It is a cephalic disorder that results from a neural tube defect that occurs when the rostral (head) end of the neural tube fails to close, usually between the 23rd and 26th day following conception. [ 2 ]
Anencephaly (without brain) is a severe neural tube defect that occurs when the anterior-most end of the neural tube fails to close, usually during the 23rd and 26th days of pregnancy. This results in an absence of a major portion of the brain and skull.
Spina bifida is a type of neural tube defect related to but distinct from other types such as anencephaly and encephalocele. [13] Most cases of spina bifida can be prevented if the mother gets enough folate before and during pregnancy. [3] Adding folic acid to flour has been found to be effective for most women. [14]
analgesic, apathy, anencephaly: ab-from; away from Latin abduction, abdomen: abdomin-of or relating to the abdomen: Latin abdōmen, abdomen, fat around the belly abdomen, abdominal -ac: pertaining to; one afflicted with Greek -ακός (-akós) cardiac, celiac: acanth-thorn or spine: Greek ἄκανθα (ákantha), thorn
Failure of the rostral end of the neural tube to close results in anencephaly, or lack of brain development, and is most often fatal. [43] Failure of the caudal end of the neural tube to close causes a condition known as spina bifida , in which the spinal cord fails to close.
Exencephaly is a type of cephalic disorder wherein the brain is located outside of the skull. This condition is usually found in embryos as an early stage of anencephaly.As an exencephalic pregnancy progresses, the neural tissue gradually degenerates.
Encephalocele is a neural tube defect characterized by sac-like protrusions of the brain and the membranes that cover it through openings in the skull.These defects are caused by failure of the neural tube to close completely during fetal development.
Jaxon Emmett Buell (August 27, 2014 – April 1, 2020) was an American child known for being born missing about 80% of his brain due to anencephaly. [1] He surpassed doctors' expectations, who predicted he would not live to see his first birthday. He actually lived over five-and-a-half years.