An upper cervical angle determined/measured by drawing a line across the posterior (back, or when lying more horizontal, the top) side of the lower clivus and intersecting that line with a line drawn on the posterior side of the axis (2nd cervical vertebra).  If the angle created is less than 135 degrees, it is considered pathological.

Clivo-axial, Clivo-axial angle, clivo-axial, clivo-axial angle


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