The infraclavicular brachial plexus block covers all muscles of the upper limb distal to the shoulder:
The radial nerve innervates – the elbow extensor muscles – the wrist extensor muscles
The musculocutaneous nerve innervates the elbow flexor muscles
The ulnar nerve innervates the intrinsic muscles of the hand including the medial finger flexors
The median nerve innervates the wrist flexor muscles including the lateral finger flexors
Blue: axillary nerve (not covered by an infraclavicular block); green: musculocutaneous nerve; purple: radial nerve; blue: median nerve; yellow: ulnar nerve; gray: teres minor and major nerves (axillary and subscapular nerves – not covered by an infraclavicular block); orange: pectoral nerves.
