The single and cylindrical bone from the arm to the elbow is called the humerus. It is the first and largest bone of the forelimb. It consists of three parts. Head, body and neck. It has a round head on top. The head is inserted into the genoid cavity. There are two high tubercles (arbuds) on either side of the head. In the middle of it there is a groove or anatomical neck.
The body of the humerus is called the shaft. There is a high mound in its middle region. This is called deltoid ridge. At the lower end of the humerus is the epicondyle. Below the epicondyle lies the condyle. Condyle consists of capitulum and trochlea. Below the trochlea is the olicranon foramen.