Variation The divide between the two innervations is at the insertion of the deltoid. We’ll go back to where we last saw the radial nerve. The radial nerve is a major peripheral nerve of the upper limb. RADIAL NERVE . In the axilla, it lies behind the axillary and upper brachial arteries and passes anterior to the tendons of teres minor, latissimus dorsi and subscapularis.It enters the posterior compartment of the arm passing through a triangular space, formed by the lateral humerus, long head of triceps and teres minor. Anatomy : Anatomy of the Radial Nerve; The nerve is one of the terminal branches of the posterior cord.In the axilla, it lies behind the axillary and upperbrachial arteries and passes anterior to the tendons of teres minor, latissimus dorsi and subscapularis. In the upper arm, it innervates the three heads of the triceps brachii – which acts to extend the arm at the elbow. The radial nerve also gives rise to branches that supply the brachioradialis and extensor carpi radialis longus (muscles of the posterior forearm). 3The Diagnostic Anatomy of the Radial Nerve The radial nerve is the “great extensor” of the upper arm, innervating nearly all the extensor movements in the upper extremity. It diivides, as we saw, into a superficial and a deep branch. However, in 70-80% of people, the muscle has double innervation with the radial nerve (C5-T1). Motor function. It arises from the posterior cord of brachial plexus and contains fibres from nerve roots C5 to T1; COURSE. The radial nerve is one of the terminal branches of the posterior cord. Here’s the radial nerve. posterior cutaneous nerve of the arm Here we are at the elbow, with brachioradialis retracted. Now we’ll look at the three main nerves of the forearm and hand, the radial, the median and the ulnar. The radial nerve innervates the muscles located in the posterior upper arm and posterior forearm. It is a major peripheral nerve in the upper limb. An anatomical study of the brachial portion of the radial nerve with surgical implications is proposed. It also controls sensation in part of the hand. Although its chief importance is muscular innervation, the radial nerve also carries sensory information from a significant portion of the posterior arm, forearm, and hand. - See: - Posterior Interosseous Nerve Syndrome : - Radial Nerve Palsy Associated w/ Humeral Shaft Frx: - Radial Nerve Block - Tendon Transfers for Radial Nerve Palsy: - Anatomy: - three posterior divsions of brachial plexus form posterior cord: (C5, C6, C7, C8, T1) - radial nerve (C5, C6, C7, C8, and T1) is largest of & most frequently injured branch of both the posterior cord (as The radial nerve is responsible for extending the wrist and fingers. The brachialis muscle is innervated by the musculocutaneous nerve, which runs on its superficial surface, between it and the biceps brachii. - just proximal to the wrist, several branches fan out to provides sensory innervation to dorsal radial aspect of hand; - superficial branch innervates the dorsal aspect of the first web space & hand as far as the middle of the ring finger and as far distally as the proximal interphalangeal joint; - Nerve Block: courses on the posterior wall of the axilla (on subscapularis, latissimus dorsi, teres major) 3 Branches in axilla. superficial branch radial nerve; dorsal digital branch; Origin: Radial nerve originates from the posterior cord of the brachial plexus (C5-T1) behind axillary artery; Course: Posterior wall axilla.
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