Motor Functions. The radial nerve innervates the muscles located in the posterior arm and posterior forearm. In the arm, it innervates the three heads of the triceps brachii, which acts to extend the arm at the elbow.
What nerve innervates the posterior compartment of the forearm?
The muscles in the posterior compartment of the forearm are commonly known as the extensor muscles. The general function of these muscles is to produce extension at the wrist and fingers. They are all innervated by the radial nerve.
What nerves innervate the arm muscles?
The musculocutaneous nerve is responsible for innervating the flexors of the arm, including the biceps brachii, coracobrachialis, and the medial aspect of the brachialis. The radial nerve innervates the triceps brachii, lateral aspect of the brachialis, anconeus, brachioradialis, and extensor carpi radialis longus.
What are the nerves that innervate the skin of the forearm?
The five branches of the brachial plexus are the musculocutaneous, axillary, median, ulnar, and radial nerves.  All contribute to the innervation of the forearm except the axillary nerve.
What muscles are innervated by the radial nerve?
The radial nerve and its branches provide innervation the following muscles (See Structure and Function for specific nerve branch innervations and muscle actions):
- Abductor pollicis longus.
- Extensor carpi radialis brevis.
- Extensor carpi radialis longus.
- Extensor carpi ulnaris.
What are the three deep muscles in the posterior compartment of the forearm?
The deep posterior forearm muscles are a group of five muscles located in the deep layer of the posterior compartment of the forearm. These muscles include the supinator, abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus and extensor indicis.
What nerve supplies the posterior muscles of the arm?
The radial nerve is a nerve in the human body that supplies the posterior portion of the upper limb. It innervates the medial and lateral heads of the triceps brachii muscle of the arm, as well as all 12 muscles in the posterior osteofascial compartment of the forearm and the associated joints and overlying skin.
Which nerves go to the arms?
Five major nerves extend from the brachial plexus into the arm: the axillary, musculocutaneous, median, radial, and ulnar nerves. Each of these nerves carries information in the form of nerve impulses to and from a particular region of the arm and hand.
Which three nerves supply the muscles of the upper arm?
Anterior Compartment. There are three muscles located in the anterior compartment of the upper arm – biceps brachii, coracobrachialis and brachialis. They are all innervated by the musculocutaneous nerve.
What nerve abducts the arm?
Deltoid – situated at the superior aspect of the shoulder. It performs abduction of the upper limb at the glenohumeral joint and is innervated by the anterior terminal branch of the axillary nerve.
What nerve passes on the medial side of the arm and forearm?
It travels posteriorly to the medial side of the arm and passes through a musculoaponeurotic structure known as the arcade of Struthers to reach the epicondyle of the humerus within the cubital tunnel.
What are the three main nerves in your arm?
Three main nerves run past the elbow and wrist to the hand.
- Median nerve. This nerve passes down the inside of the arm and crosses the front of the elbow. …
- Ulnar nerve. This nerve passes down the inside of the arm. …
- Radial nerve. This nerve passes down the back and outside of the upper arm.
What are the 5 major nerve Innervations of shoulder arm?
The five branches are the last segments of the brachial plexus. The terminal branches include the following nerves: musculocutaneous, axillary, radial, median, and ulnar. Each nerve has a distribution that coincides with the muscles they innervate.
Is radial nerve damage permanent?
Most people with a radial nerve injury will recover within three months of starting treatment if the nerve is not torn or lacerated. But some cases ultimately require surgery. If your radial nerve is entrapped, surgery can relieve pressure on the nerve.
What nerve root is radial nerve?
The radial nerve is the terminal continuation of the posterior cord of the brachial plexus. It therefore contains fibres from nerve roots C5 – T1. The nerve arises in the axilla region, where it is situated posteriorly to the axillary artery.
How do you test for radial nerve?
To diagnose a radial nerve injury, a doctor will perform a physical assessment. They will move each joint in the upper arm and ask the person to report any sensation of stretching, tingling, or pain.