The extensor carpi radialis longus is a muscle located in the forearm. It plays a crucial role in extending and abducting the wrist, allowing for movements such as lifting the hand upward and moving it away from the body. This muscle originates from the lateral supracondylar ridge of the humerus and inserts into the base of the second metacarpal bone. This muscle is part of the extensor group, which includes other muscles that help in wrist and finger movements. It is innervated by the radial nerve, which is responsible for transmitting signals that control muscle contractions. Proper functioning of the extensor carpi radialis longus is essential for various daily activities, including gripping and lifting objects.