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A total of 100 morphologically normal complete foramina magna of skull of unknown sex and age but definitely adult included in this study. This study observed that the mean (±SD) of maximum length of foramen magnum, maximum width of foramen magnum and total area of foramen magnum were 36.24 ± 1.70mm2, 30.30 ± 1.47mm2 and 862.89 ± 60.49 mm2 respectively in male. The mean (±SD) of these same variables were 32.64±1.60mm2, 27.30±1.48 mm2 and 722.55±49.82 mm2 respectively in female. All values are significantly higher in male than those of female.