part of part of Homo sapiens lumbar vertebra 3 zone of bone organ superior articular facet of third lumbar vertebra 2026-03-19T00:00:00Z A zone of bone organ forming the concave articular surface on the superior articular process of the third lumbar vertebra, oriented predominantly in the sagittal plane and facing medially. It articulates with the inferior articular facet of the second lumbar vertebra at the L2–L3 zygapophyseal joint, the most mobile segment in the mid-lumbar region. David Osumi-Sutherland