12+ Sacrum And Coccyx Anatomy Radiology. The sacrum, sometimes called the sacral vertebra or sacral spine (s1), is a large, flat triangular shaped bone nested between the hip bones and positioned below the last lumbar. Lirette ls, chaiban g, tolba r, eissa h.
The sacral region (sacrum) is at the bottom of the spine and lies between the fifth segment of the lumbar spine (l5) and the coccyx (tailbone).
Basic radiological anatomy of the brain and spine with annotated ct and mri images covering the lumbar spine count from l5 (immediately above sacrum). Anterior markings of the sacrum. Licensed in xr & ct, trained in mri & us. The sacrum (os sacrum).—the sacrum is a large, triangular bone, situated in the lower part of the vertebral column and at the upper and back part of the pelvic cavity, where it is inserted like a wedge between the two hip bones;