Fig. 45-9. Scheme of the muscles acting on the right globe. Note the actions of the superior (SR) and inferior (IR) recti on the abducted eye, and those of the inferior (IO) and superior (SO) obliqui on the adducted eye. The lowest scheme summarizes test positions for the muscles responsible for vertical movements of the abducted and adducted eyes, anterior aspect. The arrows must be followed in strict sequence, i.e., beginning with the horizontal arrows. LR, lateral rectus; MR, medial rectus; OD, oculus dexter (right eye); OS, oculus sinister (left eye).
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