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Questions and Answers
Which nerve roots innervate the sternoclavicular joint?
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?
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?
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?
What does afferent innervation refer to?
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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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