Brachial plexus

Brachial plexus

] or - Roots, Trunks, Divisions, Cords, Collateral/Pre-terminal Branches, and (Terminal) Branches.

* The five roots are the five anterior rami of the spinal nerves, after they have given off their segmental supply to the muscles of the neck.

* These roots merge to form three trunks:
** "superior" or "upper" (C5-C6)
** "middle" (C7)
** "inferior" or "lower" (C8-T1)

* Each trunk then splits in two, to form six divisions:
** anterior division of the upper, middle and lower trunks
** posterior division of the upper, middle, and lower trunks

* These six divisions will regroup to become the three cords. The cords are named by their position in respect to the axillary artery.
** The "posterior cord" is formed from the three posterior divisions of the trunks (C5-T1)
** The "lateral cord" is the anterior divisions from the upper and middle trunks (C5-C7)
** The "medial cord" is simply a continuation of the anterior division of the lower trunk (C8-T1)

* The branches are listed below. Most branch from the cords, but a few branch (indicated in italics) directly from earlier structures. The five in bold are considered "terminal branches".


pecific branches

*One can remember the specific branches of lateral, posterior and medial cord using the mnemonic LML ULNAR M4U respectively.
**LML - lateral pectoral nerve , musculocutaneous nerve , lateral root of the median nerve.
**ULNAR - upper subscapular nerve , lower subscapular nerve , nerve to latissmus dorsi (thoracodorsal nerve) , axillary nerve , radial nerve.
**M4U - medial pectoral nerve , medial root of the median nerve , medial cutaneous nerve of the arm , medial cutaneous nerve of the forearm , ulnar nerve.


ee also

* Brachial plexus lesion
* Anesthesia of the brachial plexus


External links

* [ Tutorial] at Newcastle University

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Look at other dictionaries:

  • Brachial plexus — A bundle of nerves beginning in the back of the base of the neck and extending through the axilla (armpit). The brachial plexus is formed by the union of portions of the fifth through eighth cervical nerves and the first thoracic nerve from the… …   Medical dictionary

  • Brachial plexus injury — The brachial plexus is a network of nerves that conducts signals from the spine to the shoulder, arm and hand. Brachial plexus injuries are caused by damage to those nerves. Symptoms may include a limp or paralyzed arm, lack of muscle control in… …   Wikipedia

  • Brachial plexus lesion — Infobox Disease Name = PAGENAME Caption = DiseasesDB = 31267 ICD10 = ICD10|G|54|0|g|50, ICD10|P|14|3|p|10, ICD10|S|14|3|s|10 ICD9 = ICD9|353.0, ICD9|767.6, ICD9|953.4 ICDO = OMIM = MedlinePlus = eMedicineSubj = eMedicineTopic = MeshID = D020516… …   Wikipedia

  • brachial plexus block — regional anesthesia of the shoulder, arm, and hand by injection of a local anesthetic into the brachial plexus; called also brachial plexus anesthesia …   Medical dictionary

  • brachial plexus — noun a network of nerves formed by cervical and thoracic spinal nerves and supplying the arm and parts of the shoulder • Syn: ↑plexus brachialis • Hypernyms: ↑nerve plexus * * * noun : a complex network of nerves that is formed chiefly by the… …   Useful english dictionary

  • brachial plexus neuropathy — brachial plexopathy …   Medical dictionary

  • brachial plexus — noun Date: circa 1860 a network of nerves lying mostly in the armpit and supplying nerves to the chest, shoulder, and arm …   New Collegiate Dictionary

  • brachial plexus — Anat. a network of nerves in the armpits and neck, innervating the shoulders, arms, and hands. [1855 60] * * * …   Universalium

  • brachial plexus — a network of nerves, arising from the spine at the base of the neck, from which arise the nerves supplying the arm, forearm and hand, and parts of the shoulder girdle . See also radial nerve …   The new mediacal dictionary

  • brachial plexus — A network of nerves that sends signals from the spine to the arm and hand …   English dictionary of cancer terms

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