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What is a neural tube?
The neural tube is the part of the development of the central nervous system in a developing embryo. What is pretty amazing about this is that within the first 4 weeks of development from conception, the entire framework of the central nervous system will have finished forming! Around day 18, the neural plate appears at the midline of the thickening of the ectoderm, the outermost layer of the germinal sac. Essentially what happens over the next couple of days is that the neural plate forms a depression, which eventually is pushed down and separated from the original cell layer by the fusion of the neural crests, resulting in the formation of a neural tube - this is rather hard to explain without a proper diagram!
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if measurement of neural tube is greater than 2.5mm indicates down syndrome
spina bifida is the most common defect
The neural tube is the embryonic predecessor of the brain and spinal cord. Which means, most of what it "does" is develop into a brain and spinal cord. The neural tube is init…ially formed almost exclusively of stem and progenitor cells. Over time, these stem and progenitor cells adopt specific identities and begin to differentiate neurons and later glial cells and these cells begin forming neural circuits. By the time the neural tube has developed to a point where it is capable of carrying out rudimentary neurological functions, the nomenclature is generally changed to brain and spinal cord rather than neural tube.
It is formed from neural folds that arise from the neuralgroove in a developing fetus.
The neural tube develops during the first trimester of pregnancy.
The vitamin known to help prevent neural tube defects is folic acid, also called Vitamin B9 or folate. Foods rich in folate include the following: . Black-eyed peas . Lent…ils . Okra . Kidney beans . Great Northern beans . Broccoli . Iceberg lettuce . Beets . Lima beans . Sunflower seeds . Spinach . Brussels sprouts . Corn . Asparagus . Baked beans . Green peas . Baked potato . Cabbage . Avocados . Peanuts . Romaine lettuce . Tomato Juice . Orange juice . Strawberries . Oranges . Eggs . Bananas Please see the Related link below for more information.
The neural tube closes around the 28th day of gestation, so that would be at the end of the fourth week.
Ventricles & central canal of spinal cord
The brain and spinal cord. The cephalic portion of the nueral tube becomes the brain, the caudal portion becomes the spinal cord.
In the first trimester, often before a woman even is aware that she is pregnant.
The two most common forms of neural tube defects are spina bifida and anencephaly (having been born with no brain in the skull).
There are multiple medical complications associated with spina bifida, especially the most severe form (spina bifida cystica - myelomeningocele, in which a part or parts of th…e spinal cord protrude through the skin of the back). With the second most common neural tube defect, anencephaly, death ensues rapidly (because the newborn cannot live for long without a brain in the skull). About three quarters of anencephalic babies do survive for a few days or even weeks (since primitive reflexes for suckling and elimination are controlled by the remaining brainstem and spinal cord).
In Spina Bifida
In the embryo the neural tube forms the central nervous system in the fetus, which is the brain and spinal cord. The reason pregnant women are given folic acid supplementati…on is to help prevent neural tube defects, which can range from fairly benign all the way to anencephaly (where the baby is born without a brain).
The neural tube forms the spinal cord and brain. Mistakes in the formation of these structures seems to be more common in folate deficiency. Women who may become pregnant a…re advised to take folate to prevent these birth defects.
In the 2nd week of pregnancy before most women know they are pregnant.
In the 3rd week ofpregnancy called gastrulation, specialized cells on the dorsalside of the fetus begin to change shape and form the neural tube .