The Anatomical Characteristics Of Auricular Surface Of The Sacrum

Description

Framing the lateral sacrum, the animation centers on the auricular surface, an ear-shaped, hyaline cartilage covered area on the ala sacralis that articulates with the iliac auricular surface to form the sacroiliac joint. As the sequence rotates the sacrum, adjacent landmarks come into view, including the sacral ala superiorly, the anterior sacral foramina on the pelvic surface anteriorly, and the posterior sacral foramina and median sacral crest on the dorsal surface posteriorly. The superior articular process of S1 and the sacral canal provide orientation at the superior end, while the lateral sacral crest and roughened tuberositas sacralis appear posterior to the auricular surface as the model turns. Surface texture is emphasized as the auricular area transitions into the interosseous region. Clear bony geography. Sacroiliac anatomy drives stability and pain, and the auricular surface is the key load transfer interface between axial skeleton and pelvis. Degenerative sacroiliitis, osteitis condensans ilii, and inflammatory spondyloarthropathies change joint contour and subchondral bone, and the animation’s shifting angle helps you appreciate how small variations in sacral ala width and auricular curvature affect joint congruence. The sequential rotation also clarifies why fluoroscopic or CT guided SI joint injections target the inferior posterior joint line, while the main synovial portion sits more anteriorly than many learners expect. Use this asset in pelvis and spine modules for gross anatomy, osteology labs, and radiology teaching where learners must match dry bone landmarks to AP pelvis, inlet, and outlet projections or axial CT slices. It also supports orthopedic and pain medicine content on sacroiliac joint biomechanics, arthrodesis planning, and differential diagnosis of posterior pelvic pain. Anatomical accuracy verified by SciePro's Medical Advisory Board.