anular ligament of radius
an·u·lar lig·a·ment of ra·di·us
[TA]the ligament that encircles and holds the head of the radius in the radial notch of the ulna, forming the proximal radioulnar joint and enabling pronation and supination of forearm; receives the radial collateral ligament of the elbow.
Synonym(s): ligamentum anulare radii [TA], ligamentum orbiculare radii, orbicular ligament of radius