The Suprascapular Nerve is short and somewhat thick. It is derived from the sixth, seventh, and eighth cervical roots, and passes between the supraspinatus muscle and the subscapularis. After winding round the anterior border of the scapula it gives branches to the supraspinatus, and is ultimately expended in the infra-spinatus.
The Anterior Deep Pectoral Muscle receives its nerve supply from the seventh and eight cervical nerves, while the superficial pectoral muscle obtains its fibres from the two roots of the median. A branch also passes to the posterior deep pectoral, and another longer and thicker follows the course of the spur vein.