AbstractBroca's region is composed of two adjacent cytoarchitectonic areas, 44 and 45, which have distinct connectivity to superior temporal and inferior parietal regions in both macaque monkeys and humans. The current study aimed to make use of prior knowledge of sulcal anatomy and resting‐state functional connectivity, together with a novel visualization technique, to manually parcellate areas 44 and 45 in individual brains in vivo. One hundred and one resting‐state functional magnetic resonance imaging datasets from the Human Connectome Project were used. Left‐hemisphere surface‐based correlation matrices were computed and visualized in brainGL. By observation of differences in the connectivity patterns of neighbouring nodes, areas 44 and 45 were manually parcellated in individual brains, and then compared at the group‐level. Additionally, the manual labelling approach was compared with parcellation results based on several data‐driven clustering techniques. Areas 44 and 45 could be clearly distinguished from each other in all individuals, and the manual segmentation method showed high test‐retest reliability. Group‐level probability maps of areas 44 and 45 showed spatial consis
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