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Fig. 7. —Drawing of posterior aspect of right shoulder shows posterior (p) and inferior (i) paraglenoid labral cysts and their proximity to suprascapular and axillary nerves. Suprascapular nerve (single arrowhead) enters supraspinous fossa through suprascapular notch, passing under superior transverse scapular ligament (single arrow). It supplies two motor branches to supraspinatus muscle (SS) and courses around lateral edge of scapular spine. Inferior transverse scapular ligament (double arrow) spans spinoglenoid notch, and suprascapular nerve passes under it to enter infraspinous fossa. Inferior branch of suprascapular nerve (double arrowhead) provides motor branches to infraspinatus muscle (IS). At lower border of subscapularis muscle, axillary nerve courses inferior to glenohumeral joint capsule to traverse quadrangular space (curved arrow) indicates axillary nerve in quadrangular space). Quadrangular space is bounded by teres minor (TM) and teres major muscles, superiorly and inferiorly, respectively, long head of triceps muscle medially, and humeral neck laterally. Axillary nerve supplies teres minor, part of deltoid muscle (not shown), and ends as upper lateral cutaneous nerve of arm. h = humeral head.