Innervation: Mixed peripheral nerve with motor supply to the supraspinatus and infraspinatus and sensory innervation to the posterior joint capsule. No cutaneous sensory innervation.
Passed beneath the superior transverse scapular ligament. Suprascapular artery passes above the superior transverse scapular ligament.
At risk during the posterior interval slide.
Curves tightly around the base of the scapular spine at its junction with the posterior glenoid neck, enveloped within a fat pad.
The average distance from the origin of the long tendon of the biceps to the motor branches of the supraspinatus is 2 cm. The average distance from the posterior rim of the glenoid to the motor branches of the infraspinatus muscle is 2cm. (Warner JJP,JBJS 1992; 74Am: 36-45)
