How to say "nerve" in Arabic

ʿAṣab matches עצב consonant for consonant, and Modern Hebrew uses the very same word for the anatomy: עצבים are your nerves. Remarkably, غضب ghaḍab 'anger' (see that entry) lands on the exact same Hebrew shadow ע-צ-ב, since both غ and ع collapse onto ע, and both ض and ص collapse onto צ — two different Arabic roots, one Hebrew root to catch them both. Modern Hebrew's own עצבני 'irritable, on edge' sits closer to ʿaṣab's sense — fraying nerves — while עצב 'sorrow' drifted toward ghaḍab's meaning instead.