BACKGROUND AND OBJECTIVE: Various decompressive and stabilising methods such atlas and axis vertebra (C1 and C2) transarticular screw fixation and posterior screw placement on the lateral mass are used in CVJ surgery. These operations usually target the C1, which is part of the CVJ's bony architecture.Thus, complete understanding of atlas vertebra anatomy is required for surgical planning and fracture analysis. The dimensions of the vertebral artery groove are rare in Indian literature, and even rarer in South Indian literature. This project will gather and give atlas anatomical data that may be useful for surgical planning and assessing C1 fractures.The current study sought to make the following findings:1. Examine and measure atlas vertebra specimens for morphological criteria.2. To offer anatomic data for surgical planning of the CVJ