Medical Definition of check ligament
1: alar ligament 1
2: either of two expansions of the sheaths of rectus muscles of the eye each of which probably 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 ligamentb: 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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