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Facet joints occur in pairs along the length of the. spine. The ones that cause the most problems are the ones in the neck (cervical facet joints) or the. ones in the lower back (lumbar facet joints). A denervation is a procedure that aims to modify the way the pain is transmitted from the facet. joints to the brain.
A solvation shell, in physical chemistry, is a structure used to describe solvation. A solvation shell is a shell of any chemical species that acts as a solvent and surrounds a solute species. When the solvent is water it is often referred to as a hydration shell or hydration sphere. A classic example is when water molecules form a sphere around a metal ion. The electronegative oxygen atom contained in the water molecule is attracted electrostatically to the positive charge on the metal ion. The result is a solvation shell of water molecules that surround the ion.