Suprascapular Nerve Anatomy & Injury Everything You Need To Know Dr Nabil Ebraheim скачать в хорошем качестве

Suprascapular Nerve Anatomy & Injury Everything You Need To Know Dr Nabil Ebraheim

Join this channel to support the channel    / @nabilebraheim   Suprascapular Nerve: Anatomy, Compression Syndromes, and Clinical Implications The suprascapular nerve arises from the upper trunk of the brachial plexus. It travels beneath the transverse scapular ligament at the suprascapular notch, while the suprascapular artery passes above the ligament. After crossing the suprascapular notch, the suprascapular nerve and artery travel together and pass through the spinoglenoid notch, running beneath the inferior transverse scapular ligament. The suprascapular nerve innervates two muscles: Supraspinatus Infraspinatus Suprascapular Nerve Compression Syndromes Compression at the Suprascapular Notch Affects both the supraspinatus and infraspinatus muscles Leads to weakness in shoulder abduction (supraspinatus) Causes loss of external rotation (infraspinatus) Compression at the Spinoglenoid Notch Affects only the infraspinatus muscle Causes isolated loss of external rotation Commonly seen in volleyball players Often associated with cysts, ganglia, or SLAP (Superior Labrum Anterior to Posterior) tears Clinical Correlation: Subacromial Impingement and Cuff Pathology Suprascapular nerve entrapment can mimic symptoms of rotator cuff pathology MRI imaging is useful for detecting suprascapular nerve compression due to ganglion cysts The infraspinatus muscle is the primary external rotator of the shoulder QUIZZES 1. Where does the suprascapular nerve originate? A. Lateral cord of the brachial plexus B. Upper trunk of the brachial plexus ✅ C. Middle trunk of the brachial plexus D. Posterior cord of the brachial plexus Explanation: The suprascapular nerve arises from the upper trunk of the brachial plexus, formed by the C5 and C6 nerve roots. 2. Which structure does the suprascapular nerve pass under at the suprascapular notch? A. Inferior transverse scapular ligament B. Acromioclavicular ligament C. Coracoacromial ligament D. Transverse scapular ligament ✅ Explanation: The suprascapular nerve passes beneath the transverse scapular ligament, while the suprascapular artery runs above it. 3. Which artery runs above the transverse scapular ligament? A. Subscapular artery B. Suprascapular artery ✅ C. Circumflex scapular artery D. Axillary artery Explanation: The suprascapular artery travels above the transverse scapular ligament, whereas the suprascapular nerve passes beneath it. 4. What muscles are innervated by the suprascapular nerve? A. Supraspinatus and infraspinatus ✅ B. Deltoid and teres minor C. Subscapularis and teres major D. Pectoralis major and minor Explanation: The suprascapular nerve innervates the supraspinatus and infraspinatus muscles, which are responsible for abduction and external rotation of the shoulder, respectively. 5. What movement is affected when the suprascapular nerve is compressed at the suprascapular notch? A. Shoulder internal rotation only B. Shoulder abduction and external rotation ✅ C. Elbow flexion and shoulder extension D. Wrist extension and supination Explanation: Compression at the suprascapular notch affects both the supraspinatus (abduction) and infraspinatus (external rotation) muscles. 6. Which structure does the suprascapular nerve pass under at the spinoglenoid notch? A. Coracoacromial ligament B. Inferior transverse scapular ligament ✅ C. Superior transverse scapular ligament D. Glenohumeral ligament Explanation: At the spinoglenoid notch, the suprascapular nerve passes beneath the inferior transverse scapular ligament. 7. What is the primary function of the infraspinatus muscle? A. Shoulder abduction B. Shoulder external rotation ✅ C. Shoulder internal rotation D. Elbow extension Explanation: The infraspinatus muscle is the primary external rotator of the shoulder. 8. What is a common cause of suprascapular nerve compression at the spinoglenoid notch? A. SLAP tear and ganglion cysts ✅ B. Shoulder dislocation C. Fracture of the clavicle D. Glenohumeral osteoarthritis Explanation: Compression at the spinoglenoid notch is often associated with SLAP tears, ganglion cysts, or repetitive overhead sports (e.g., volleyball players). 9. Which of the following symptoms is seen in spinoglenoid notch compression? A. Weakness in both abduction and external rotation B. Weakness in external rotation only ✅ C. Weakness in elbow flexion D. Loss of sensation over the lateral shoulder Explanation: Compression at the spinoglenoid notch affects only the infraspinatus muscle, leading to isolated loss of external rotation. 10. Which imaging modality is most useful for diagnosing suprascapular nerve entrapment? A. X-ray B. MRI ✅ C. CT scan D. Bone scan Explanation: MRI is the best imaging modality to evaluate suprascapular nerve entrapment and detect ganglion cysts or SLAP tears.