There are three canals which are aligned
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 counter roll (torsional) of both eyes. |
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