Medical Definition of annular ligament
: 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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