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Introduction: The mitral valve is a dynamic anatomical structure with one function: to prevent blood regurgitation into the left atrium. Due to this, anatomic and morphometric knowledge of the valve is of vital importance. With the purpose of arriving at a normal morphologic pattern, it is the objective of this work to study the morphometric and morphological variations of the mitral valve annulus, and the distance between it and the free edge of the leaflets. Materials and methods: A total of 22 hearts from adult human cadavers were used for this investigation, all belonging to the III Chair of Anatomy, School of Medicine of Buenos Aires University. All cadavers were fixed by soaking in an aqueous solution of 7% (v/v) formalin during 7 days. Four of them were previously subject to an acrylic coloured latex injection for their arterial and venous system. Then they were dissected, approached and photographed. Results: Dissections show anatomical variations in the measure of the mitral valve annulus diameter, with changes in 77,27% of cases related to an average value. A pattern was observed as well, in which the longitude of the anterior leaflet was in 100% of the cases longer than the longitude of the posterior leaflet. Discussion: Based on the results obtained, a different morphometric in situ study is proposed from classics descriptions about the mitral valve, based on measures of diameter between one commissure to another. Also the study of a pattern conserved in all measures is proposed, confirming the predominance in longitude of the anterior leaflet above posterior leaflet. Conclusion: It is possible to confirm the existence of anatomical and morphometric changes in the architecture of the annulus of the mitral valve, influenced by variables such as age and sex, with prevalence in the adult sample. In addition, it is possible to determine the constant presence of a pattern in which the anterior leaflet exceeds the posterior leaflet in length. [ABSTRACT FROM AUTHOR]