Abstract
The semicircular canals (SCC) located in the inner ear (Figure 1a) are our primary sensors for angular motion. The pathological presence of small calcite particles in the SCC (a condition known as canalithiasis) may lead to a common form of vertigo (benign paroxysmal positional vertigo, BPPV). A rotation of the head lifts the particles to an elevated position within the SCC. As they are falling down their viscous drag induces a lymphatic flow in the SCC which leads to a spinning sensation. The knowledge of the particle trajectories during and after a head maneuver is of central relevance for the understanding, diagnosis and treatment of BPPV.
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