Posterior cord
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| 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 |
| Dorlands / Elsevier | f_03/12356221 |
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The posterior cord is a division 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:[1]
| 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), and the extensor and abductor muscles of the thumb |
References
MBBS resources http://mbbsbasic.googlepages.com/
External links
- Atlas of anatomy at UMich hand_plexus - "Axilla, dissection, anterior view"
- Illustration at preventdisease.com
Nerves of upper limbs (primarily): the brachial plexus (C5-T1) | |
|---|---|
| Supraclavicular | root (dorsal scapular, long thoracic) - upper trunk (suprascapular, to the subclavius) |
| Infraclavicular: lateral cord | lateral pectoral
musculocutaneous (lateral cutaneous of forearm) median/lateral root: anterior interosseous - palmar - recurrent - common palmar digital (proper palmar digital) |
| Infraclavicular: 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 |
| Infraclavicular: 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 | cutaneous innervation of the upper limbs |
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
