The<unk>  is a long bone in the arm that runs from the shoulder to the elbow. On a skeleton, it fits between the scapula and the ulna. It consists of the following three sections:
Upper extremity of<unk> 
Body of<unk> 
Lower extremity of<unk>
Humerus
Calcaneus
Metatarsus
Sacrum
Head of radius
Rayon
Greater burdock
Axilla