Fig. 2
From: An anatomical study of arcuate foramen and its clinical implications: a case report
A higher magnification of specimen A of the right posterolateral aspect of sub-occipital region showing the atlas with complete dorsal and lateral bridges; and the oval opening between the two bridges. Also, the passage of vertebral artery through the tunnel formed by the posterior and lateral bridges. The sub-occipital nerve (C1 dorsal ramus) along with branches of VA emerging from the oval opening. 1. Dorsal bridge; 2. Vertebral artery; 3. C1 dorsal ramus; 4. Lateral bridge; 5. Denticulate ligament; 6. C2 dorsal root ganglion; 7. C2 dorsal ramus; 8. C2 ventral ramus; 9. Branches of VA; 10. Dorsal tubercle of atlas; 11. Dorsal arch of atlas