The Latin word for muscle, used in anatomical terminology. Refers to contractile tissue that produces movement in organisms.
From Latin 'musculus' meaning 'little mouse', a diminutive of 'mus' (mouse). Ancient anatomists thought flexing biceps resembled a mouse moving under the skin.
The Romans saw mice everywhere - not just in muscles, but also named the mussel shellfish 'musculus' because they thought it looked like a little mouse! This whimsical naming shows how ancient people found familiar shapes in the natural world.
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