钩[形]束（英语：uncinate fasciculus，UF）由人体大脑内一白质纤维束（white matter tract）组成，是额叶眶面皮质（orbitofrontal cortex）和海马体、杏仁体的联合纤维束。

The uncinate fasciculus is a white matter tract in the human brain that connects parts of the limbic system such as the hippocampus and amygdala in the temporal lobe with frontal ones such as the orbitofrontal cortex. Its function is unknown though it is affected in several psychiatric conditions. It is the last white matter tract to mature in the human brain.