part of part of Homo sapiens mammalian cervical vertebra 4 zone of bone organ inferior articular facet of fourth cervical vertebra 2026-03-19T00:00:00Z A zone of bone organ on the inferior articular process of the fourth cervical vertebra (C4), presenting an obliquely oriented smooth articular surface directed anteroinferiorly and laterally to articulate with the superior articular facet of C5. David Osumi-Sutherland