These are distal to the upper subscapular nerve. The thoracodorsal artery is a branch of the subscapular artery. It is innervated by the subscapular nerve. The lower subscapular nerve contains two branches. The rim of the subscapular fossa also evidently provided a site for muscle attachment. Subscapularis&colon; originates on the subscapular fossa and inserts on the greater tubercle of the humerus. The inferior portion of the subscapularis is innervated by the lower subscapular nerve. This space transmits the subscapular artery and axillary nerve. This includes the abdominal area, the subscapular region, arms, buttocks and thighs. The axons then branch from the posterior cord and form the upper subscapular nerve. The subscapular nerves are innervated by the posterior division of the brachial plexus. Other tributaries include the subscapular vein, circumflex humeral vein, lateral thoracic vein and thoraco-acromial vein.