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ANATOMIC ATLAS FOR THE CANINE LUMBOSACRAL SPINE
Dorsal - Discs: Nucleus Pulposus
Transverse
Sagittal
Dorsal
1. Intervertebral disc: Cartilaginous joint between endplates of adjacent vertebrae. Consists of concentric bands of fibrous tissue (annulus fibrosus) surrounding a central gelatinous portion (nucleus pulposus). Type II disc degeneration is one of the most common causes of nerve root compression in dogs with degenerative lumbosacral disease. With type II disc degeneration, the annulus bulges outwardly in all directions and bone spurs form on the vertebral endplates at the attachment sites for the annulus.
2. L7-S1 disc: annulus fibrosus.
3. L6 body.
4. Quadratus lumborum.
5. Transverse process: paired bony prominences that project laterally from the region where the pedicle joins the vertebral body. In the lumbar region, they project cranially and ventrally. Serve as attachment sites for paraspinal muscles. Ventral branches of the spinal nerves course ventral to these processes.
6. Wing of ilium.
7. Sacroiliac joint: partly cartilaginous and partly synovial. Permits rotational and lateral movement of the pelvis relative to the sacrum. Can develop osteoarthritis and become a source of pain in the lower back region. Dogs with congenital lumbosacral vertebral anomalies can also have assymmetrical sacroiliac joints.
8. Retroperitoneal fat.
9. Coccygeus.
10. Gluteus medialis.
11. Sartorius.
12. Gluteus superficialis.
13. Erector spinae.
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2. L7-S1 disc: annulus fibrosus.
3. L6 body.
4. Quadratus lumborum.
5. Transverse process: paired bony prominences that project laterally from the region where the pedicle joins the vertebral body. In the lumbar region, they project cranially and ventrally. Serve as attachment sites for paraspinal muscles. Ventral branches of the spinal nerves course ventral to these processes.
6. Wing of ilium.
7. Sacroiliac joint: partly cartilaginous and partly synovial. Permits rotational and lateral movement of the pelvis relative to the sacrum. Can develop osteoarthritis and become a source of pain in the lower back region. Dogs with congenital lumbosacral vertebral anomalies can also have assymmetrical sacroiliac joints.
8. Retroperitoneal fat.
9. Coccygeus.
10. Gluteus medialis.
11. Sartorius.
12. Gluteus superficialis.
13. Erector spinae.
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