Vol. 33, Nš 4

Anatomical variations of pterion: analysis of the possible anatomical variations of pterion in human skulls**

Ruiz, C. R.; Souza, G. C.; Scherb, T. O.; Nascimento, S. R. R.

KEYWORDS: anatomic variations, skull, pterion

ABSTRACT: Introduction: The pterion is an anatomical region located in the temporal fossa between frontal, sphenoid, and temporal bones. In the literature, we observed that the pterion can suffer many anatomical variations which depend on several factors, such as gender and ethnicity, and its form can vary in relation to the skull side. Objectives: To study and analyze the variations that can occur in the pterion, related to the type and symmetry, in relation to gender, age, side of the skull and ethnicity. Materials and Methods: We examined 55 skulls of both sexes belonging to the Department of Skulls Museum of Anatomy Descriptive and Topographic UNIFESP. The Pterions were outlined with pencil on tracing paper and from this drawing and the information of each skull perform our analysis. Results: In our sample, the pterion types vary as follows: sphenoparietal (90%), frontotemporal (4.54%), epiteric (3.64%) and stellate (1.82%). The most common types of female skulls were sphenoparietal (85%), and the least common types were stellate (2.5%). For the male skulls, the most common types were sphenoparietal (92.86%), and the least common types were stellate (1.43%). For the skull of white subjects, the most common types were sphenoparietal (98.08%), and the least common types were frontoparietal (1.92%). For the skull of non-white subjects, the most common types were sphenoparietal (82.75%), and the least common types were stellate (3.45%). Conclusion: We concluded that the most common pterions found in the entire sample were the sphenoparietal being predominant in sex, ethnicity, and side but there are variations in relation to the least common pterion types taking into consideration side, sex, and ethnicity.