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Year :2013
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Month :
September-October
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Volume :
2
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Issue :
3
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Page :
3 - 6
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Bilateral Arcuate Foramen in a Human Atlas Vertebra - A Case Report
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Correspondence Address :
Vinod Kumar B., John Joseph S. MartiS, Vijin V.,
Dr. Monika Lalit Piplani,
Assistant Professor, Department of Anatomy,
SGRDIMSR, Amritsar, Punjab, India.
Phone: 09814325454
E-mail: monika.lalit@yahoo.com
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Introduction: The arcuate foramen or retroarticular vertebral artery ring is formed by the bony bridges over groove for vertebral artery on the posterior arch of atlas vertebrae. It is formed by ossification of the oblique ligament of atlas; i.e., the fibrous tissue present at the lower border of posterior atlanto-occipital membrane. A complete ring is reported to be seen in 2% to 14% of the subjects. However, a bilateral complete ring is extremely rare seen only in 1.1% of subjects. We are reporting here one such case where a retroarticular vertebral artery ring was present on both the sides of the same atlas. On the right side its anteroposterior (length) diameter was 6.4 mm and superoinferior diameter (height) was 5.3 mm respectively. The corresponding figures on the left side were 6.2mm & 4.9 mm. A knowledge of such vertebral rings is useful not only for neurophysicians and neurosurgeons but also for radiologists and medical practitioners in general. Its clinical and surgical implications are discussed in detail and a flood of light has been thrown on different theories of its development whether ontogenically, phylogenically or environmentally.
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