International Journal of Anatomy and Research

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Type of Article: Original Research

Year: 2016 | Volume 4 | Issue 3 | Page No. 2513-2517

Date of Publication: 31-07-2016



Seema, 1, Poonam Verma 2, Anupama Mahajan 3.

1 Professor, Department of Anatomy, Sri Guru Ram Das Institute of Medical Sciences and Research, Amritsar, Punjab, India.

2 Professor, Department of Anatomy, Sri Guru Ram Das Institute of Medical Sciences and Research, Amritsar, Punjab, India.

3 Professor and Head, Department of Anatomy Sri Guru Ram Das Institute of Medical Sciences and Research, Amritsar, Punjab, India.

Address: Dr Seema, Professor, Department of Anatomy, Sri  Guru Ram Das Institute of Medical Sciences and Research, Vallah, Amritsar, Punjab, India.


Background Atlas is the first cervical vertebra articulating above with the occipital condyles of the skull and below with the axis vertebra. Anatomy of this first cervical vertebra show great morphological variations. Atlas bony out growths known as Ponticles which can be lateral or posterior are commonly found. These ponticles can compress the third part of vertebral artery leading to vertebrobasilar insufficiency. Atlas vertebra is approached in a number of surgical procedures like transpedicular screw fixation, transarticular screw fixation interlaminar clamp and for interspinous wiring.
Aim: To find out the incidence of retroarticular groove or canals in North Indian population in order to avoid postoperative complications arising due to these anatomical variations.
Material and Methods:
The present study was done on fifty dry adult human atlas vertebrae of unknown sex taken from Department of Anatomy, Sri Guru Ram Das Institute of Medical Sciences and Research, Amritsar. They were carefully studied for the  presence of retroarticular groove or canal.
Results: The retroarticular groove or canal were found in eight vertebrae (16%). Presence of these retroarticular canals predisposes to Barre –Lieou and Cervicogenic syndromes especially in neck movements.
Conclusion: These bony bridges embracing the vertebral artery are responsible for vertigo and vertebrobasilar insufficiency. The present study can be helpful to radiologists, anthropologists and neurosurgeons to avoid many postoperative complications.
Key words: Cervical, Axis, Occipital,  Vertebrobasilar, Transpedicular.


  1. Williams PL, Bannister LH, Berry MM, Collins P, Dyson M, Dussek JE, Ferguson MWJ. In: Skeletal System. 38th Edn. Churchill Living stone. New York. 1995:519.
  2. Lamberty BGH and Zivanovic S. The retro articular vertebral artery ring of the atlas and its significance. Acta Anat. 1973;85:113-122.
  3. Long J. Cranio cervical region Osteology and articulations. Neuro orthop. 1986;1:67-92.
  4. Sylvia S, Kulkarni S, Hatti A. Bilateral Retro Articular  ring in Atlas vertebra  –  A Case Report. Anatomica  Karnataka. 2011;5(1):81-86.
  5. Sun JY. Foramen arcuals and vertigo. Zhonghua Wai Ke Za Zhi 1990;28(10):592-4,636-7.
  6. Romanus T and Tovi A. A variation of the Atlas. Roetgenologic incidence of a bridge over the groove on the atlas for the vertebral artery. Acta Radiol Diagn. (Stocks) 1964;2:289-97.
  7. Senguel G, Kadioglu HH. Morphometric Anatomy of the atlas and axis vertebrae. Turkish Neuroanatomy. 2006;16(2):69-76.
  8. Neo M, Sakamoto T, Fujibayashi S, Nakamura T. The clinical risk of vertebral artery injury from cervical pedicle screws which were inserted   in degenerative vertebra. Spine. 2005;30(24):2800-5.
  9. Leventhal MR. Campbell’s Operative Orthopaedics In: Spinal Anatomy and Surgical Approach. 9th edn; Vol. 3. Mosby, St. Louis; 1998;2:681-270.
  10. Hanson PB, Montesano PX, Sharkey NA. Anatomic and biochemical assessment of transarticular screw fixation for the atlanto-axial instability. Spine. 1991;16:1141–5.
  11. Wysocki J Buhrowski M, Reymond J Kwiastkowski J. Anatomical variants of the cervical vertebrae and the first thoracic vertebra in man. Folia Morpho. 2003;62: 357-63.
  12. Chauhan R, Khanna J. Absence of costal element of the foramen transversarium of atlas vertebrae. Int  J Res Med Sci. 2013;1:66-8.
  13. Krishnamurthy, Nayak SR, Khan S, Prabhu  La Tha V, Lakshmi A, et al. References :Arcuate foramenof atlas: incidence, phylogenetic and clinical significance. Romanian Journal of Morphology and Embryology. 2007;48(3):263-66.
  14. Agrawal D, Mohanty BB, Shetty S, Parija B, Hazary SK and China a PK. Variations in foramen transversarium: An osteological study in eastern India. Int J of current research.2012;4(9):120-122.
  15. Manjunath KY. Posterior bridging of the atlas vertebra in South Indians. Incl. J Med. Sci. 2001;55(9):488-90.
  16. Velenae C, Barzu S, Panescu S and Udroiu C, Retrotransverse groove or canal of atlas and its significance. Acta Anatemica Basel. 1997;97:400-2.
  17. Gupta SC, Gupta CD, Arora HK, Maheshwari BB.  The retro transerse groove/canal in Indian Atlas vertebral. Anat Anz. 1979;145:514-16.
  18. Bilodi AK and Gupta SC. Presence of retrotransverse groove or canal in atlas vertebrae. J. Anat Soc. Ind. 2005;54(1):16-18.
  19. Malukar O, Prajapati VP, Nagar SK. Ponticulus. J of Med. Res. 2011;1(2):51-5.
  20. Thiel H. Gross morphology and pathoanatomy of the vertebral arterier. J Manipulat Physiol, Ther. 1991;14:133-41.
  21. Karau, BP, Ogengo JA., Hassanali J, Odula PO. Morphometry and Variations of Bony Ponticles of the Atlas Vertebrae (CI) in Kenyans. Int J Morphol. 2010; 28(4):1019-24.
  22. Cacciola F, Phalke U, Goel A. Vertebral artery in relationship to C1 –C2 vertebra: An anatomic study. Neurology India. 2004;52(2):178–84.
  23.  Gosavi SN. Morphometric Study of the Atlas Vertebra using Manual. Malays Orthop J. 2012;6(3):18-20.
  24. Kaushal P. Median deficiency in the posterior arch of the atlas vertebra: a case report. Int J Anat Vari, 2011;4:67-8.


Seema, Poonam Verma, Anupama Mahajan. STUDY OF HUMAN ATLAS VERTEBRAE FOR THE PRESENCE OF RETROARTICULAR GROOVE OR CANAL IN NORTH INDIANS. Int J Anat Res 2016;4(3):2518-2521. DOI: 10.16965/ijar.2016.248




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