superior oblique muscle (SO)

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Introduction

Extraocular muscle in the orbit.

Origin

above the medial margin of the optic canal

Insertion

  • by a tendon passing through the trochlea (pulley), then reflected backward & downward, & laterally to the sclera between the superior & lateral recti

Action

Innervation

trochlear nerve (CN IV)

Physical examination

Test: ask patient to look downward & inward

More general terms

Additional terms

References

  1. Grant's Atlas of Anatomy, 10th edition, AMR Agur & MJ Lee (eds), Lippincott Williams & Wilkins, Philadelphia, 1999
  2. Stedman's Medical Dictionary 27th ed, Williams & Wilkins, Baltimore, 1999