palmar radioulnar ligament palmar radioulnar ligament the palmar radioulnar ligament (volar radioulnar ligament, anterior radioulnar ligament) is a narrow band of fibers extending from the anterior margin of the ulnar notch of the radius to the front of the head of the ulna. palmar radioulnar ligamentligaments of wrist. anterior viewdetailsfromradiustoulnaidentifierslatinligamentum radioulnare palmareta21785anatomical terminology it is sometimes abbreviated prul.