Skeletal System
Superior Articular Facets of Sacrum
Facies articulares superiores ossis sacri
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The superior articular facets are the smooth, concave, posteromedially facing articular areas on the superior articular processes of the sacrum. They articulate with the corresponding inferior articular facets of the fifth lumbar vertebra, forming the zygapophyseal joints.
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Sacrum
The sacrum, fixed in space by the tension of its ligaments and fascial envelope, functions as the connecting link between the spine and upper (or forequarter) extremities, and the pelvis and lower (hindquarter) extremities.
