A-15
Indicates variable contribution
Cutaneous innervation
Muscular innervation
Axillary nerve
Radial nerve
C5
C6
C5
C6
C7
C8
T1
Teres minor
Deltoid
Triceps brachii
(long head)
Triceps brachii
(medial head)
Anconeus
Extensor carpi radialis longus
Brachioradialis*
Extensor carpi radialis brevis
Supinator
Extensor carpi ulnaris
Abductor pollicis longus
Extensor pollicis brevis
Extensor pollicis longus
Extensor indicis
Extensor digiti minimi
Extensor digitorum
Triceps brachii
(lateral head)
*Functionally brachioradialis acts as a
flexor of the forearm. It develops from the
posterior compartment and thus is
innervated by a posterior division nerve.
Axillary
nerve
Axillary
nerve
Radial
nerve
Radial
nerve
Radial
nerve
Posterior view
Anterior view
The nerves from the
posterior division of the brachial plexus
innervate
the muscles in the posterior compartments: the extensor muscles of the
upper limb. These nerves continue distally to supply cutaneous innervation
to much of the posterior arm, forearm, and hand.
A-15
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