ACTIONS OF EOM
Medial Rectus and Lateral Rectus have only primary action.
All other muscles have a primary and two subsidiary actions.
Primary action of oblique muscles is tortion
Primary action of SR is elevation and IR is depression.
Subsidiary actions
Mnemonic:SINRAD
All superiors are Intorters- SR and SO
All inferiors are Extorters-IR and IO
All Recti are Adductors
All obliques are abductors
Superior Oblique-Copying muslce
Inferior oblique-Stargazers muscle.
SO- depression
IO- Elevation
In abducted position SR acts as pure elevator.
In adducted position SO pure depressor.
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