A small cup-shaped anatomical structure, especially the dome-shaped part of the inner ear involved in balance and hearing.
From Latin 'cupula' meaning small cup, a diminutive of 'cupa'. Used in anatomy to describe various cup-shaped structures in the body.
The cupula in your inner ear is so sensitive it moves just by turning your head, sending signals to your brain about balance—it's why you know which way is up even in the dark.
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