The axillary (circumflex) nerve (C5, 6) arises from the posterior cord of the
Fig. 140 The segmental cutaneous innervation of the body.
• muscular—to deltoid and teres minor;
• cutaneous—to a palm-sized area of skin over the deltoid.
The axillary nerve may be injured in fractures of the humeral neck or in dislocations of the shoulder. This will be followed by weakness of shoulder abduction, wasting of the deltoid and a small patch of anaesthesia over this muscle.
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