part of part of Homo sapiens lumbar vertebra 2 zone of bone organ superior articular facet of second lumbar vertebra 2026-03-19T00:00:00Z A zone of bone organ comprising the concave, medially facing articular surface borne on the superior articular process of the second lumbar vertebra, oriented in the sagittal plane. It articulates with the inferior articular facet of the first lumbar vertebra, forming the L1–L2 zygapophyseal joint and resisting rotational forces in the lumbar spine. David Osumi-Sutherland