The radial nerve

Fig. 140 The segmental cutaneous innervation of the body.

The radial nerve (C5, 6, 7, 8, T1) is the main branch of the posterior cord.

Fig. 141 The distribution of the radial nerve.

Fig. 141 The distribution of the radial nerve.

Posterior Cutaneous Nerve Triceps

Lying first behind the axillary artery, it then passes backwards between the long and medial heads of the triceps to lie in the spiral groove on the back of the humerus between the medial and lateral heads of triceps (Fig. 141). The profunda branch of the brachial artery and its venae comitantes accompany the nerve in this part of its course (Fig. 122).

At the lower third of the humerus, the radial nerve pierces the lateral intermuscular septum to re-enter the anterior compartment of the arm between brachialis and brachioradialis (a convenient site for surgical exposure, Fig. 137). At the level of the lateral epicondyle its important posterior interosseous nerve is given off, which winds round the radius within the supinator muscle then sprays out to be distributed to the extensor muscles of the forearm.

The radial nerve itself continues as the superficial radial nerve, lying deep to brachioradialis (Fig. 137). Above the wrist, it emerges posteriorly from beneath this muscle to end by dividing into cutaneous nerves to the posterior aspects of the radial 3- digits.

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Responses

  • merimac burrows
    What are the clinical manifestation of the radial nerve?
    8 years ago

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