- Discussion:
    - subscapular and thoracodorsal nerves arise from posterior cord of brachial plexus
           while this is on costal surface of subscapularis;
    - both subscapular nerves usually receive fibers from C5 and C6;
    - upper subscapular nerve passes directly into the upper part of subscapularis muscle;
    - lower subscapular nerve divides into 2 branches;
           - one enters the lower part of the subscapularis muscle and the other continues to teres major