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OCULAR MOTILITY

• Saccule vs Utricle
•  “Saccule is Standing” – the saccule processes vertical linear movement (vs the Utricle, which processes horizontal movement)
• Adduction vs Abduction
• ADduction – “adding eyes together” (turn in eyes)
• ABduction – “abduct/take away eyes” (turn out eyes)
• How to remember positive vs negative vertical divergence
• NEGATIVE Vertical Divergence = relative DOWNward rotation of the RIGHT eye – “When you feel NEGATIVE, you feel DOWN RIGHT sad”
• [Positive Vertical Divergence = relative upward rotation of the right eye]
• Extraocular muscle (EOM) functions
• If you can memorize and reproduce this drawing, you can easily remember the function of the EOMs
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• Note: the inferior oblique does extorsion (lateral rotation), the superior oblique does intorsion (medial rotation)
• You can remember this by the mnemonic “inferior people extort”