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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.

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©2013 UpToDate ® Print Email Upper cervical vertebrae, assembled: posterosuperior view Atlantoaxial anatomy. The first two cervical vertebrae are specialized bones that function as an important unit. The atlas (C1) articulates with the occiput of the skull superiorly and with the axis (C2) inferiorly.