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. 2016 Nov 4;8(1):29–47. doi: 10.1007/s13244-016-0530-5

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© The Author(s) 2016

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Schematic of craniocervical junction developmental segmentation and resegmentation during embryogenesis. Abbreviations: OccSom1 - occipital somite 1; OccSom2 - occipital somite 2; OccSom3 - occipital somite 3; OccSom4 - occipital somite 4; CSom1 - cervical somite 1; CSom2 - cervical somite 2; CSom3 - cervical somite 3; CScler1 - cervical sclerotome 1; CScler2 - cervical sclerotome 2; BO - basiocciput; Bas - basion; OC - occipital condyles; FMalp - anterolateral foramen magnum and opisthion; Ataarch - anterior arch of C1 vertebra (atlas); Atparch - posterior arch of C1 vertebra (atlas); ApDens - apical segment of the dens; BaDens - basal segment of the dens; body of C2 vertebra (axis). Severed black line denotes the embryological separation between the cranial skull base and cervical spine during craniocervical junction development