Pars interarticularis
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The pars interarticularis or simply pars (plural: partes interarticulares) is the part of a vertebra located between the superior and inferior articular processes.
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Gross anatomy
In the axis and the thoracolumbar spine, the pars interarticularis is a narrow isthmus between the superior and inferior facets. In the subaxial cervical spine, the pars interarticularis equivalent is termed the lateral mass or articular pillar.
In the axis, the pars interarticularis is located anterolateral to the spinal canal 5. In the thoracolumbar spine, the pars interarticularis is located posterolateral to the spinal canal.
Radiographic features
In the axial plane, the pars is located at the junction of the pedicle and lamina.
In the oblique lumbar radiograph, the neck of the Scottie dog represents the pars.
Related pathology
pars defect (spondylolysis)
Quiz questions
References
- 1. Moore KL, Agur AMR, Dalley AF. Clinically oriented anatomy. LWW. ISBN:1451119453. Read it at Google Books - Find it at Amazon
- 2. Last's anatomy, regional and applied. Churchill Livingstone. ISBN:044304662X. Read it at Google Books - Find it at Amazon
- 3. Butler P, Mitchell A, Healy JC. Applied Radiological Anatomy. Cambridge University Press. (2012) ISBN:0521766664. Read it at Google Books - Find it at Amazon
- 4. Susan Standring. Gray's Anatomy. ISBN: 9780702052309
- 5. Ebraheim N, Fow J, Xu R, Yeasting R. The Location of the Pedicle and Pars Interarticularis in the Axis. Spine (Phila Pa 1976). 2001;26(4):E34-7. doi:10.1097/00007632-200102150-00002 - Pubmed
Incoming Links
- Grade II anterolisthesis of L5 over S1
- Oppenheimer ossicle
- Chalk stick fracture
- Oppenheimer ossicle
- Collar sign in spondylolysis
- Pars interarticularis defect
- Pars interarticularis defect
- Pars interarticularis defect
- Pars interarticularis defect
- Spondylolisthesis, spondylolysis and spondylosis, with osteoporosis and bilateral L5 sacralisation
- Pars interarticularis
- Bilateral pars defect
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