Final answer:
The part of the arm that is most distal to the shoulder is the distal humerus, which forms the elbow joint.
Step-by-step explanation:
The distal humerus refers to the lower part of the humerus bone, which is one of the long bones of the upper arm. The humerus extends from the shoulder joint to the elbow joint and is divided into three main parts: the proximal humerus, the shaft (diaphysis), and the distal humerus.
The part of the arm that is most distal to the shoulder of the human body is the distal humerus. The distal humerus is the flattened end of the upper arm bone that forms the elbow joint. It consists of the trochlea medially and the capitulum laterally.