The arcuate fasciculus is a curved bundle of association fibres that arches around the back end of the lateral sulcus, connecting the posterior temporal lobe with the frontal lobe. In the dominant hemisphere it links Wernicke area with Broca area and is the core of the language network. It is often described with or as part of the superior longitudinal fasciculus.
| Location | Deep white matter of the frontal, parietal and temporal lobes, arching around the posterior end of the lateral sulcus |
|---|---|
| Connections | |
| Blood Supply | Middle cerebral artery (deep branches) |
Connects the areas that understand and produce language, allowing repetition of words and linking sound to speech.
Classically, damage causes conduction aphasia: fluent speech and good comprehension but poor repetition with sound errors. It is mapped with diffusion tractography before surgery near language areas. Its development and asymmetry are studied in dyslexia and language disorders.
Poor repetition with fluent speech and relatively intact comprehension, from arcuate fasciculus or supramarginal damage.
Damage during tumour removal that may cause lasting aphasia, prevented by preoperative mapping.
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