Matching Canals and Muscles
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with the three conjugate muscle pairs.
Horizontal > ipsilateral MR & contralateral LR
Anterior > ipsilateral SR & contralateral IO
Posterior > ipsilateral SO & contralateral IR
This allows the eye to rotate about any axis in three dimensions: horizontal, vertical or torsional
E.g. rolling the head, right ear down, activates the anterior and posterior canals on the right.
This in turn activates the SR & SO on the right side and the IR and IO
on the left side.
The result is a counterroll (torsional) of both eyes.
