S-072 | Anatomical Variability of the Accessory Sulci in the Inferior Frontal Gyrus

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Author: Julian Leonardo Cicler | Email: juliancicler@icloud.com

Julian Cicler^1°, Axel Colombo^1°, Daiana Gonzalez^1°,  Tomas Picone^1°, Julieta Valdivia^1°, Valentina Duzer Salvador^1°, Gonzalo Bonilla^1°,  Mariana Bendersky^2°

^1° Laboratorio de Neuroanatomía, III Cátedra de Anatomía, Facultad de medicina, Universidad De Buenos Aires
^2° Laboratorio de Anatomía Viviente, III Cátedra de Anatomía, Facultad de medicina, Universidad De Buenos Aires

Introduction:
The inferior frontal gyrus (IFG) is crucial in motor control and language processing. Its anatomy has been widely studied due to the variability in the presence of accessory sulci, such as the diagonal sulcus (DS) and the triangular sulcus (TS). This study aims to analyze the anatomical variability of these sulci, determining their frequency and describing their morphological characteristics to justify their importance in the quantification of gray matter in language areas.
Materials and Methods:
A total of 115 T1-weighted magnetic resonance imaging (MRI) scans of healthy individuals’ brains were analyzed. The variables assessed included the presence of DS and TS, the morphology of the DS and its relation to the ascending branch of the lateral sulcus (ABLS), and the termination of the TS.
Results:
The DS was found in 53.05% of the left hemispheres (LH) and in 48.69% of the right hemispheres (RH), while the TS was identified in 70.43% of the LH and in 63.49% of the RH. The DS exhibited notable variability in its pattern, with a tendency to terminate over the ABLS. The TS characterized by its termination in the inferior frontal sulcus and the circular sulcus.
Conclusions:
The prevalence of these sulci in the IFG is significant, with considerable variability in their depth and termination patterns, focusing on the importance of recognizing and understanding these anatomical variations to enhance the precision in studying this region.