Sacral Anatomy




Computed Tomography (CT) Axial Oblique Sacrum


Superior to Inferior



Figure 4-1


CT Axial Oblique.

L5-S1 disc level. 1. L5-S1 intervertebral disc 2. S1 superior articular facet 3. L5 inferior articular facet 4. L5 lamina 5. Spinous process L5 6. Thecal sac 7. Iliac crest 8. L5-S1 facet joint 9. Multifidus muscle 10. Erector spinae muscle group 11. L5 nerve root 12. Iliacus muscle 13. Gluteus medius muscle.



Figure 4-2


CT Axial Oblique.

S1 vertebral body level. 1. S1 vertebral body 2. S1 nerve root 3. Thecal sac 4. Sacral ala 5. Sacroiliac joint, synovial portion 6. Iliac crest 7. Median sacral crest 8. Inferior L5-S1 facet joint 9. Ligamentum flavum 10. Sacroiliac joint, fibroligamentous portion 11. Multifidus muscle 12. Erector spinae muscle group 13. Gluteus medius muscle 14. Gluteus minimus muscle 15. Iliacus muscle.



Figure 4-3


CT Axial Oblique.

S1-2 disc level. 1. S1-2 intervertebral disc, remnant 2. Sacral ala 3. Sacroiliac joint, synovial portion 4. Thecal sac 5. S2 nerve root 6. S1 nerve root 7. S1 ventral sacral foramen 8. S1 dorsal sacral foramen 9. Median sacral crest 10. Gluteus maximus muscle 11. Gluteus medius muscle 12. Gluteus minimus muscle 13. Sacroiliac joint, fibroligamentous portion 14. Iliacus muscle 15. Multifidus muscle.



Figure 4-4


CT Axial Oblique.

S2 vertebral body level. 1. S2 vertebral body 2. Sacroiliac joint, synovial portion 3. Sacroiliac joint, fibroligamentous portion 4. Sacral ala 5. Iliac bone 6. S2 nerve root 7. S3 nerve root 8. Multifidus muscle 9. Gluteus maximus muscle 10. Gluteus medius muscle.



Figure 4-5


CT Axial Oblique.

S2-3 disc level. 1. S2-3 intervertebral disc, remnant 2. Iliac bone 3. Sacral ala 4. Sacroiliac joint, synovial portion 5. S2 nerve root exiting through S2 ventral sacral foramen 6. S2 dorsal sacral foramen 7. Sacral canal 8. Multifidus muscle 9. Sacroiliac joint, fibroligamentous portion 10. Gluteus maximus muscle 11. Median sacral crest.



Figure 4-6


CT Axial Oblique.

S3 vertebral body level. 1. S3 vertebral body 2. Sacral ala 3. Sacroiliac joint, synovial portion 4. Multifidus muscle 5. Sacral canal.



Figure 4-7


CT Axial Oblique.

Lower S4 vertebral body level. 1. Sacral hiatus 2. S4 vertebral body 3. Sacral ala 4. Gluteus maximus muscle.






Magnetic Resonance Imaging (MRi) Axial Oblique Sacrum



Figure 4-8


MR T1-weighted Axial Oblique.

L5-S1 disc level. 1. L5-S1 intervertebral disc 2. S1 superior articular facet 3. L5 inferior articular facet 4. L5 lamina 5. Spinous process L5 6. Thecal sac 7. Iliac crest 8. L5-S1 facet joint 9. Multifidus muscle 10. Erector spinae muscle group 11. L5 nerve root 12. Iliopsoas muscle 13. Aorta.



Figure 4-9


MR T1-weighted Axial Oblique.

S1 vertebral body level. 1. S1 vertebral body 2. S1 nerve root 3. Thecal sac 4. Sacral ala 5. Sacroiliac joint, synovial portion 6. Iliac crest 7. Median sacral crest 8. Inferior L5-S1 facet joint 9. Ligamentum flavum 10. Sacroiliac joint, fibroligamentous portion 11. Multifidus muscle 12. Erector spinae muscle group 13. Gluteus medius muscle.

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Aug 25, 2019 | Posted by in NEUROLOGICAL IMAGING | Comments Off on Sacral Anatomy

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