A crossover effect is created when nerves and blood vessels do not stop at the midline because some nerve branches crossover into an area innervated by another adjacent nerve.

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If the crossover nerve comes from the right side at the midline,it innervates something on the left side.Giving an anesthetic on the left side in this case does not work because the nerve that crossed over from the right innervates this area.When dealing with anesthetics in the areas of the central incisors it is sometimes necessary to anesthetize both sides due to this crossover effect.Crossover nerves occur not only at the midline but between areas affected by different nerve branches.A crossover effect can also occur at the junction between areas adjacent to each other but typically innervated by two different nerve branches.If one nerve block does not affect the desired target area,a second nerve block (that normally serves the adjacent area)might be required.

A Crossover Effect Is Created When Nerves and Blood Vessels