ABSTRACT
Background: Foramen Magnum (FM) is a latin word meaning the largest aperture in the base of the skull. It is ovaland wider behind, with the greatest diameter (dm) being antero-posterior (AP). The major vital neuroanatomicpasses through this largest foramen. Many authors have classified FM depending upon its shapes.Objectives: To determine the morphometric parameters of Foramen MagnumMaterials and Methods: The study was conducted on 71 dry human skulls of unknown sex and measured itsAntero-Posterior, Transverse, Right Oblique and Left Oblique diameters with the help of digital caliper.Result: The dormancy of Oval shaped Foramen Magnum was found in this study. The range of Antero-posteriorand Transverse diameter falls between 30.22-40.9 mm and 22.67-33.36 mm respectively. The range of Rightoblique and Left Oblique diameter was found in between 20.84-35.52 mm and 28.88-35.47 mm respectively.Conclusion: The present study will useful not only for anatomists but also in neurosurgery. As the nomenclatureof the opening in the occipital bone at the base of the skull and bounded by Oval and Rounded on visualizationsupported by Antero-Posterior and Transverse diameter of the opening.