part of part of connected to connected to Homo sapiens system axillary artery lateral thoracic artery https://upload.wikimedia.org/wikipedia/commons/4/4c/Axillary_branches.PNG SCTID:206135006 UBERON:0001396 NCIT:C52951 arteria thoracalis lateralis A blood vessel that supplies oxygenated blood to the lateral structures of the thorax and breast. It originates from the axillary artery and follows the lower border of the Pectoralis minor muscle to the side of the chest, supplies the serratus ventralis muscle and the Pectoralis major muscle, and sends branches across the axilla to the axillary lymph nodes and Subscapularis muscle. It anastomoses with the internal thoracic artery, subscapular, and intercostal arteries, and with the pectoral branch of the thoracoacromial artery. In the female it supplies an external mammary branch which turns round the free edge of the Pectoralis major and supplies the breasts. [WP,unvetted]. external mammary artery EMAPA:37095 MA:0001989 FMA:22674 UMLS:C0226421 Wikipedia:Lateral_thoracic_artery shoulder artery