The forearm is made up of two bones: the radius and ulna. The ulna is the
larger of these two bones. The radius and ulna on the forearm form a hinge with the upper arm bone called the humerus and this enables the arm to flex and extend.

The wrist is made up of eight individual bones called the carpals and are
named: trapezium, trapezoid, scaphoid, lunate, triquetral, pisiform, capitate and hamate.

The palm of the hand is made up of bones called the metacarpals and the
finger bones are called the phalanges. The fingers are made up of three bones except for the thumb, which has two.