Two answers required. Treatment of one condition impacting these two bones results in a characteristic “cock-robin” posture after surgery. The Fuchs view is a radiographic technique for identifying Jefferson fractures in one of these two bones. Injury likelihood to the transverse ligament found between these two bones is diagnosed with the Rule of Spence. The Powers (-5[1])ratio is constructed from a point on each of these two bones to the basion in the (*) foramen magnum. Common causes of injury to these two bones include (-5[1])transverse stress from the occipital (10[2])condyles and avulsion fractures to the dens. The more superior of these two bones lacks a body, since it has (10[1])fused with the inferior one to enable a greater range of (10[1]-5[1])motion. (-5[1])Subluxation of one or both of these bones may result in an “instability” common in victims of diving accidents or car crashes. For 10 (-5[1])points, name this pair of uppermost vertebrae. (10[6]0[5])■END■