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 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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Merriam-Webster unabridged
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