The internal jugular vein provides information about the wave forms and right atrial pressure. The pulsations of the internal jugular vein are beneath the sternocleidomastoid muscle and are visible as they are transmitted through the surrounding tissue. The vein itself is not visible. Because the right internal jugular vein is straighter than the left, only the right internal jugular vein is evaluated. Measurements from the external jugular system, which is easier to visualize, are much less accurate and should not be used.
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