Posterior cord: Definition from Answers.com

Nerve: Posterior cord

Plan of brachial plexus. (Posterior cord is shaded gray.)

The right brachial plexus with its short branches, viewed from in front. The Sternomastoid and Trapezius muscles have been completely, the Omohyoid and Subclavius have been partially, removed; a piece has been sawed out of the clavicle; the Pectoralis muscles have been incised and reflected.
Latin	fasciculus posterior plexus brachialis
Gray's	subject #210 933
Innervates	none
From	brachial plexus - posterior divisions of the three trunks
To	subscapular, up. and low. thoracodorsal axillary radial

The posterior cord is a part of the brachial plexus. It consists of contributions from all of the roots of the brachial plexus.^[1]

The posterior cord gives rise to the following nerves:^[2]

Name	Roots	Supplies
upper subscapular nerve	C5-C6	subscapularis muscle of the rotator cuff
lower subscapular nerve	C5-C6	teres major
thoracodorsal nerve	C6-C8	latissimus dorsi muscle
axillary nerve	C5-C6	sensation to the shoulder and motor to the deltoid muscle and the teres minor muscle
radial nerve	C5-C8, T1	triceps brachii muscle, the brachioradialis muscle, the extensor muscles of the fingers and wrist (extensor carpi radialis muscle), supinator, and the extensor and abductor muscles of the thumb

References

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Supraclavicular

Infraclavicular

lateral cord	lateral pectoral musculocutaneous (lateral cutaneous of forearm) median/lateral root: anterior interosseous · palmar · recurrent · common palmar digital (proper palmar digital)

medial cord	medial pectoral cutaneous: medial cutaneous of forearm · medial cutaneous of arm ulnar: muscular · palmar · dorsal (dorsal digital nerves) · superficial (common palmar digital, proper palmar digital) · deep median/medial root: see above

posterior cord	subscapular (upper, lower) · thoracodorsal axillary (superior lateral cutaneous of arm) radial: muscular · cutaneous (posterior of arm, inferior lateral of arm, posterior of forearm) · superficial (dorsal digital nerves) · deep (posterior interosseous)

Other

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