Where does the brachioradialis muscle originate?

The brachioradialis muscle originates from the distal humerus. This muscle is primarily located in the forearm and plays a key role in flexing the elbow, particularly when the forearm is in a mid-pronated position. The origin from the distal humerus provides the necessary leverage and mechanical advantage for its function during movements such as lifting or throwing.

In contrast, the other listed locations are associated with different muscles. The supraspinatus fossa of the scapula is the origin of the supraspinatus muscle, which is involved in shoulder abduction. The infraglenoid process is where the long head of the triceps brachii originates, contributing to elbow extension. The lateral border of the scapula relates to muscles like the teres minor. Understanding these anatomical origins helps clarify the specific actions and roles of each muscle group in the upper extremity.