Nerve that originates from the posterior cord of the brachial plexus with roots from the last four cervical vertebrae and first thoracic vertebrae.
One of the three major nerves of the arm. The descends at the back of the arm closely applied to the humerus and into the forearm. It is ultimately distributed to the skin at the back of the arm, forearm, and hand, the extensor muscles on the back of the arm and forearm, the elbow, joint, and many other joints of the hand.
The main motor nerve in the arm, running down the back of the upper arm and the outer side of the forearm.
Largest branch of the brachial plexus, the network of nerves supplying the arm.
An important mixed sensory and motor nerve of the arm, forming the largest branch of the ‘brachial plexus. It extends downward behind the humerus, supplying muscles of the upper arm, to the elbow, which it supplies with branches, and then runs parallel with the radius. It supplies sensory branches to the base of the thumb and a small area of the back of the hand.
This nerve arises from the brachial plexus in the axilla. It ends just above the elbow by dividing into the superficial radial and interosseous nerves. It supplies motor function to the muscles which extend the arm, wrist, and some fingers, and supplies sensation to parts of the posterior and lateral aspects of the arm, forearm and hand.
One of the main nerves emerging from the brachial plexus of the lower lateral neck. It contains axons from spinal segments C5-C7, innervates the extensor muscles of the elbow, hand, and fingers; the brachioradialis muscle; the abductor pollicis longus muscle, and also the skin of the posterior (dorsal) surface of most of the upper extremity.
Sensory-motor nerve that, with its branches, supplies the thumb side of the arm and back of the hand.
A division of the brachial plexus, the radial nerve, a primary nerve in the arm, extends from the shoulder to the hand. This nerve is responsible for governing the muscles that facilitate wrist extension. It also transmits sensory signals from the rear of the forearm, the thumb, the second and third fingers, as well as the base of the thumb.
Injury to the radial nerve can occur due to a fracture of the humerus (the upper-arm bone) or prolonged pressure on the armpit, as seen with crutch usage. Such damage can lead to a condition known as wristdrop, characterized by an inability to extend the wrist, along with numbness in the regions of the skin served by the radial nerve.