1. Breathnach AS (1958) Vertebral column: Frazer’s anatomy of the human skeleton, 5th edn. Churchill, London, pp 25–29
2. Duckworth WLH (1911) Report on an abnormal first thoracic vertebra. J Anat Physiol 6:65–68
3. Hamilton WJ, Mossman HW (1972) Cardio-vascular system: human embryology, 4th edn. Heffer, Cambridge, pp 261–271
4. Newell RLM, Bogduk N, Lee J (2008) The Back. In: Standring S (ed) Gray’s anatomy, 40th edn. Elsevier, New York, p 722
5. Satti SR, Cerniglia CA, Koenigsberg RA (2007) Cervical vertebral artery variations: an anatomic study. AJNR 28:976–980