The lunate bone (semilunar bone) is a carpal bone (wrist bone) in the human hand that may be distinguished by its deep concavity and crescentic outline. It is situated in the center of the proximal row of the carpus region between the fore arm and hand (manus). In standard medical posture, the lunate carpal bone is situated between the lateral Scaphoid bone and medial Triquetral bone. The lunate carpal bone straddles distally the bordering ulna and radius bones and proximally to distal carpus (wrist) Trapezium bone and Trapezoid bone. The etymology of the Lunate bone derives from the Latin luna which means "moon", the lunate bone looks semi-similar to a crescent moon...