Spina bifida

Spina bifida describes birth defects caused by an incomplete closure of one or more vertebral arches of the spine, resulting in malformations of the spinal cord. The spinal membranes and spinal cord may protrude through the absence of vertebral arches (called a cleft). These malformations fall into three categories: spina bifida occulta, spina bifida cystica (myelomeningocele) and meningocele.

Related Topics:
Birth defect - Spine - Spinal cord

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Spina bifida is a type of neural tube defect. Neural tube defects can usually be detected during pregnancy by AFP screening or a detailed fetal ultrasound. Spina bifida may be associated with other malformations as in dysmorphic syndromes, often resulting in spontaneous miscarriage. However, in the majority of cases spina bifida is an isolated malformation. Spina bifida has varying prevalence in different human populations. This and extensive evidence from mouse strains with spina bifida suggests a genetic basis. As with other human diseases such as cancer, hypertension and atherosclerosis (coronary artery disease), spina bifida likely results from the interaction of multiple genes and environmental factors. Despite much research on spina bifida we still do not know what causes the majority of human cases. Nevertheless, there is substantial evidence supporting a significant protective effect of Folic acid (0.4mg/day) when taken by women early in pregnancy. It is important to note that spina bifida occurs by the 4th week of pregnancy before many women will be aware of a pregnancy, thus it is generally recommended that women of child-bearing age take a folic acid supplement (most multivitamins contain 0.4mg folic acid) if they are sexually active. Genetic counseling and further genetic testing, such as amniocentesis, may be offered during the pregnancy as some neural tube defects are associated with genetic disorders such as trisomy 18.

Related Topics:
Neural tube defect - AFP screening - Ultrasound - Folic acid - Genetic counseling - Genetic testing - Amniocentesis - Trisomy 18

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The most common locations of the malformations are in the lumbar and sacral areas. The lumbar nerves control the muscles in the hip, leg, knee and foot, and help to keep the body erect. The sacral nerves control some of the muscles in the feet, bowel and bladder and the ability to have an erection. Some degree of impairment can be expected in these areas.

Related Topics:
Lumbar - Sacral - Muscle - Hip - Leg - Knee - Foot - Feet - Bowel - Bladder - Erection

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Spina bifida is a Latin term meaning "split spine." Occulta means "hidden."

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