Fig. 5.

(A) Lateral view of the scapula. The scapula spine forms an angle (39.5° ± 5.8°) to the axis of the scapula blade. The content of the suprascapular fossa cannot be revealed when scanning from the ultrasound probe (a), which is behind the dorsal border of the scapular spine, because of the obstruction of view from the scapular spine. By moving the ultrasound probe position to (b), the content of the suprascapular fossa cannot be revealed either. The optimal ultrasound probe position is at (c) when the probe is almost at the coronal plane with a slight anterior tilt. (B) Ultrasonographic image of the suprascapular nerve on the floor of the scapular spine between suprascapular notch and spinoglenoid notch. Both suprascapular nerve and artery run underneath the fascia of supraspinatus muscle. Reproduced with permission from USRA (www.usra.ca).