Answer:
Technically 1 asthe arm is only the region of the upper limb that is between the sholder and elbow joint. That 1 is called the humerus. In the whole of the upper exretmist there are 30, humerus, radius, ulna, scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, sapitate, hamate, metacarpals1-5, procimal phallanges 1-5, distal phallanges 1-5 and middle phalangees 1-4 (on digitis 2-5)