Plural of crus; the legs or leg-like structures in humans or animals; in anatomy, specifically the portions of limbs between major joints.
From Latin crura, the plural of crus meaning 'leg.' Directly adopted into English anatomical terminology from Latin, which is standard practice in medical vocabulary.
Crura is one of those anatomical terms showing Latin's ghost in modern medicine—whenever you see anatomy words ending in -a or -ae, you're hearing the echoes of Roman-era medical scholars!
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