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Brachial Plexus

  1. What is the brachial plexus?
    an arrangement of nerve fibers running from the spine
  2. The brachial plexus is formed by the rami from the ____ to the _____ nerves and the ____ nerve.
    C5 to C8 (Cervical nerves) and the T1 (Thoracic nerve).
  3. Merging rami form the ___ of the brachial plexus.
    roots
  4. The roots unite to form 3 _____.
    trunks
  5. Where is the brachial plexus located???
    in the posterior triangle of the neck

    *the triangular gap is formed by the anterior and middle scalene muscle and 1st rib --where muscles are attached.
  6. C5 and C6 combine to form the ________ trunk.
    superior trunk.
  7. C7 forms the ______ trunk.
    middle
  8. C8 and T1 combine to form the ____ trunk.
    inferior
  9. Trunks divide into ____.
    divisions
  10. Divisions are made up of what two parts??
    Anterior and posterior divisions
  11. Trunks run posterior to the ____.
    clavicle
  12. Trunks pass from the neck to the axilla through the _____ ____.
    cervicoaxillary canal
  13. When the trunks cross the first rib what happens?
    they divide into the anterior and posterior divisions.
  14. The anterior divisions usually supply the ______ muscles.
    flexor
  15. The posterior divisions usually supply the _____ muscles.
    extensor
  16. All 3 posterior divisions unite to form the ____ ___.
    posterior cord
  17. The anterior divisions of the superior and middle trunks unite to form the ____ __.
    lateral cord
  18. The anterior division of the inferior trunk forms the ___ __.
    medial cord
  19. The lateral cord contains what 3 branches?
    • 1. lateral pectoral nerve
    • 2. musculocutaneous nerve
    • 3. lateral root of the median nerve .
  20. What does the musculocutaneous nerve innervate?
    the flexors of the upper arms
  21. What does the median nerve supply?? (3)
    • supplies:
    • 1. primarily the flexor muscle in the anterior compartment of the forearm,
    • 2. the skin of part of the hand, and
    • 3. 5 hand muscles
  22. The medial cord has 5 branches.. but what are the 2 nerves we should know??
    • Ulnar nerve
    • and medially root of median nerve
  23. What does the ulnar nerve supply??
    • supplies:
    • 1. half of the muscles in the anterior compartments of the hand,
    • 2. most of the intrinsic muscles in the hand,
    • 3. and the skin on the median side of the hand
  24. The posterior cord has 5 branches..what 2 nerves should we know??
    axillary nerve and radial nerve
  25. What 3 areas does the axillary nerve supply???
    • 1. teres minor
    • 2. deltoid
    • 3. skin over inferior half of deltoid
  26. What 2 areas does the radial nerve supply?
    supplies all extensor muscles of the posterior compartments of the upper limb and the skin on the postural aspect of the arm and forearm
Author
Corissa.Stovall
ID
244813
Card Set
Brachial Plexus
Description
A&P Exam 4
Updated

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