Background: Determination of sex is one of the key questions to be answered in cases of unidentified bodies in medicolegal cases or anthropological studies. A number of studies are available in this regard. The studies being population specific and in general are of not universal help. Present study is an attempt to establish metrical parameters of ulna for the determination of sex.Materials & Methods: 193 adult human ulnae comprised 133 male and 60 female from the Bone Bank of Govt. Medical College Aurangabad, were used for the present study. Parameters like Length of Ulna (L), width of Proximal Ulnar width (PWD), Distal Ulnar Width (DWD) and Head Circumference (HC), Olecranon Anterioposterior Diameter (OAPD), were recorded and analyzed statistically. Mean, SD, P values and demarking points for male and female are obtained. Cross validation of the ulnae is done using the obtained Demarking points.Results: All the parameters are found to be statistically significant and Demarking points are found to be valid in sorting the ulnae. Conclusion: The Metrical parameters of long bones including ulnae are of immense help in determination of sex of deceased person specially in cases where skeletal remains available are very less.

Key Words- Sexual Dimorphism, Demarking Points, P Value, Forensic Anthropology, Skeletal Collection