Page 207 - Clinical Anatomy

ECA3 7/18/06 6:45 PM Page 192

192 The upper limb

Fig. 140◊The segmental
cutaneous innervation of
the body.
plexus and winds round the surgical neck of the humerus in company with
the posterior circumflex humeral vessels (Figs 122, 141). Its branches are:
•◊◊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.

The radial nerve

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