Base of Sacrum Anatomy in 3D | Rolandic Anatomy

The broad superior surface of the S1 vertebra that articulates with L5. The "sacral promontory" at this base is a key obstetric landmark for measuring the pelvic inlet.

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Related structures

Sacrum Ala of Sacrum Apex of Sacrum Auricular Surface of Sacrum Dorsal Surface of Sacrum Lateral part of sacrum Pelvic Surface of Sacrum Superior Articular Process of Sacrum