Friday, 14 August 2015

Extra ocular muscles

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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