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intorsion

   Also found in: Dictionary/thesaurus, Medical, Legal, Wikipedia 0.01 sec.
intorsion [in′tȯr·shən]
(biology)
Inward rotation of a structure about a fixed point or axis.


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The superior rectus and inferior rectus are weak and the superior oblique remains unopposed so there is ocular intorsion on downgaze.
Action of the Extraocular Muscles with the Eye in Primary Position Muscle Primary Action Secondary action Tertiary Action Medical rectus Adduction --- --- Lateral rectus Abduction --- --- Superior rectus Elevation Intorsion Adduction Inferior rectus Depression Extorsion Adduction Superior oblique Intorsion Depression Abduction Inferior oblique Extorsion Elevation Abduction The medial and lateral recti of each eye contract reciprocally to move the eyes from side to side.
 
 
 
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