The =suprascapular= (Fig. 441) is a large nerve derived chiefly, if not
exclusively, from the sixth and seventh cervical components of the
brachial plexus. It passes between the supraspinatus and subscapularis
muscles and turns around the distal fourth of the anterior border of the
scapula to reach the supraspinous fossa. It gives branches to the
supraspinatus and continues backward and upward into the infraspinous
fossa, where it supplies the infraspinatus, deltoid, and teres minor
muscles.
The direct relation of this nerve to the scapula renders it liable to
injury, the result of which may be paralysis and atrophy of the
muscles supplied by it.