The biological protection of the brain when malnutrition temporarily affects body growth is known head-sparing.
- The fetal head sparing thesis is one that underpins asymmetricalintra-uterine growth restriction, where the difference between normal head circumference and reduced abdominal circumference is attributed to the fetus's capability to preferentially supply the cerebral, coronary, adrenal and splenic gyrations.
- The brain is defended by the bones of the cranium and by a covering of three thin membranes called meninges. The brain is also softened and protected by cerebrospinal fluid. This watery fluid is produced by special cells in the four hollow spaces in the brain, called ventricles.
- It flows through the ventricles and in spaces between the meninges. Cerebrospinal fluid also brings nutrients from the blood to the brain and removes waste products from the brain.
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