n 1  :  ALAR LIGAMENT 1  2  :  either of two expansions of the sheaths of rectus muscles of the eye each of which prob. restrains the activity of the muscle with which it is associated  a  :  an expansion of the sheath of the lateral rectus that is attached to the lacrimal bone - called also lateral check ligament   b  :  an expansion of the sheath of the medial rectus that is attached to the zygomatic bone - called also medial check ligament  .
 
 
 
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