Where on the humerus is the flexor of the elbow?

The primary flexor of the elbow is the biceps brachii, which originates from the scapula and attaches to the radial tuberosity on the radius, not directly on the humerus. However, the brachialis, another key flexor, originates from the anterior surface of the humerus, specifically the distal half of the shaft. It inserts onto the ulnar tuberosity and coronoid process of the ulna, contributing significantly to elbow flexion.