The provider inserts a needle at the junction between the skull and the first cervical vertebra, directing the needle toward the sagittal suture, the joint line that divides the skull in half vertically. Or, he inserts the needle laterally between the first and second cervical vertebra, which he may refer to as the atlantooccipital, craniovertebral, or occipitovertebral joint. He then injects a medication to treat a neurological condition or contrast material for an imaging study.
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