Skeletal anatomy of the fingertip and distal interphalangeal joint. The distal phalanx has the rough and enlarged ungual process (UP) that the radial and ulnar lateral interosseous ligaments (LIL) insert on distally and originate from proximally lateral collateral ligaments and lateral expansions of the extensor and flexor tendons. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.