Brachial plexus

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Brachial plexus

  1. 1. Brachial Plexus
  2. 2. Brachial Plexus  Is a network of nerve fibers, running from the spine, formed by the ventral rami of the lower four cervical and first thoracic nerve roots (C5-C8, T1).  It proceeds through the neck, the axilla (armpit region), and into the arm.  It is a network of nerves passing through the cervico-axillary canal to reach axilla and supplies brachium (upper arm), antebrachium (forearm) and hand.
  3. 3. Anatomy  The brachial plexus is divided into Roots, Trunks, Divisions, Cords, and Branches. There are five "terminal" branches and numerous other "pre-terminal" or "collateral" branches that leave the plexus at various points along its length.
  4. 4. Root  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. The brachial plexus emerges at five different levels; C5, C6, C7, C8, and T1.
  5. 5. Trunk  These roots merge to form three trunks:  "superior" or "upper" (C5-C6)  "middle" (C7)  "inferior" or "lower" (C8, T1)
  6. 6. Division  Each trunk then splits in two, to form six divisions:  anterior divisions of the upper, middle, and lower trunks  posterior divisions of the upper, middle, and lower trunks
  7. 7. Cord  These six divisions will regroup to become the three cords. The cords are named by their position with respect to the axillary artery.  The posterior cord is formed from the three posterior divisions of the trunks (C5-C8,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)
  8. 8. Branches  Most branch from the cords, but a few branch (indicated in italics) directly from earlier structures. The five on the left are considered "terminal branches".

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