n :  a ringlike ligament or band of fibrous tissue encircling a part  a  :  any of the transverse bands holding in place the extensor and flexor tendons of the wrist and ankle  b  :  a strong band of fibers surrounding the head of the radius and retaining it in the radial notch of the ulna - called also orbicular ligament   c  :  any of several strengthening bands of the tendon sheaths of the digits  d  :  a ring attaching the base of the stapes to the oval window .
 
 
 
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