The canals lie in roughly the
same planes as the extraocular
muscles:
· Horizontal canals: lateral and
medial recti.
· LARP: left vertical recti, right
obliques.
· RALP: right vertical recti, left
obliques.
Each canal excites a pair of
muscles and inhibits a pair of
muscles in its plane.  Its partner
excites the muscles it inhibits,
and vice-versa.