The arc-shaped association pathway (fasciculus arcuatus) is part of the lower section of the upper longitudinal association pathway. The filamentous mass connects the temporal-lobe area (BA
) 41, 42, 22 and parts of 39 with the area of the frontal lobe 44, 45. In the vast majority of people, this means that the arc-shaped association pathway in the left hemisphere of the brain connects Wernicke's
field, the sensory speech center, with Broca's field
, the motor speech center.