Upper extremity innervation n148
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Questions and Answers

Which nerve roots innervate the sternoclavicular joint?

  • C1 and C2
  • C3 and C4 (correct)
  • C5 and C6
  • C7 and C8

What is the primary innervation for the trapezius muscle?

  • Axillary nerve
  • Subscapular nerve
  • Thoracodorsal nerve
  • Cranial nerve XI (correct)

Which nerves provide motor innervation to the shoulder muscles?

  • Dorsal scapular and long thoracic nerves
  • Pectoral and suprascapular nerves
  • Axillary, subscapular, and thoracodorsal nerves (correct)
  • C5-T1 nerve roots

What does afferent innervation refer to?

<p>Sensory innervation (B)</p> Signup and view all the answers

Study Notes

  • Shoulder muscles are innervated by nerves from the brachial plexus.
  • Posterior cord nerves (axillary, subscapular, thoracodorsal) and more proximal nerves (dorsal scapular, long thoracic, pectoral, suprascapular) provide motor innervation.
  • Trapezius muscle is primarily innervated by cranial nerve XI.
  • Upper extremity nerve roots are listed in Appendix II, Parts A-C.
  • Clinical assessment of motor and sensory C5-T1 nerve roots is covered in Appendix II, Parts D-E.
  • Sternoclavicular joint is innervated by C3 and C4 nerve roots.
  • Acromioclavicular and glenohumeral joints are innervated by C5 and C6 nerve roots.
  • Sensory innervation is responsible for transmitting sensory information from the joints to the brain.
  • Afferent innervation refers to sensory innervation.
  • Suprascapular and axillary nerves provide sensory innervation to the acromioclavicular and glenohumeral joints.

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