It enters the cubital fossa, where it divides into superficial and deep branches. The superficial branch courses towards the wrist lateral to the radial artery which runs with it one third of the way down the forearm and enters the hand, dividing into the dorsal digital cutaneous branches. It lies from above downwards on supinator, pronator teres and flexor digitorum superficialis and is posterior to brachioradialis. It eventually emerges from under the tendon of brachioradialis proximal to the radial styloid and passes over the anatomical snuffbox.
The deep branch gives off the posterior interosseous nerve , which passes between the heads of the supinator muscle to enter the posterior compartment of the forearm, runs in the plane between the deep and superficial muscles of the compartment, and terminates at the level of the wrist joint.
Radial nerve pathology is complex and can occur at any level axillary, spiral groove, radial tunnel, posterior interosseous, superficial radial :. Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. Updating… Please wait. Unable to process the form. Check for errors and try again. Thank you for updating your details. Log In. Sign Up. Become a Gold Supporter and see no ads.
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Knipe, H. Radial nerve. Reference article, Radiopaedia. URL of Article. On this page:. Quiz questions. Diagnostic and Surgical Imaging Anatomy. Read it at Google Books - Find it at Amazon 2. Last's anatomy, regional and applied. Churchill Livingstone.
Read it at Google Books - Find it at Amazon 3. Clinically oriented anatomy. Read it at Google Books - Find it at Amazon 4. Applied Radiological Anatomy. The radial nerve and its branches supply the dorsal muscles, such as triceps brachii , the extrinsic extensors of the wrist and hands, and the cutaneous nerve supply to most of the back of the hand.
The ulnar nerve cutaneously innervates the back of the little finger. The radial nerve divides into a deep branch, which becomes the posterior interosseous nerve , and continues as the superficial branch which goes on to innervate the dorsum back of the hand. The radial nerve originates as a terminal branch of the posterior cord of the brachial plexus. It goes through the arm, first in the posterior compartment of the arm , and later in the anterior compartment of the arm , and continues in the forearm.
From the brachial plexus, it travels posteriorly through what often called the triangular interval US or lower triangular space UK. After giving off branches to the long and lateral heads of the triceps brachii , it enters a groove on the humerus, the radial sulcus. Along with the deep brachial artery , the radial nerve winds around in the groove between the medial and lateral heads of the triceps towards the forearm, running laterally on the posterior aspect of the humerus.
While in the groove, it gives off a branch to the medial head of the triceps brachii. At this point, it pierces the lateral intermuscular septum and enters the anterior compartment of the arm.
It continues its journey inferiorly between the brachialis and brachioradialis muscles. When the radial nerve reaches the distal part of the humerus , it passes in front of the lateral epicondyle and continues in the forearm.
In the forearm, it branches into a superficial branch primarily sensory and a deep branch primarily motor. Cutaneous innervation is provided by the following nerves:. The superficial branch of the radial nerve provides sensory innervation to much of the back of the hand, including the web of skin between the thumb and index finger. Muscular branches of the radial nerve :.
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