The lateral thoracic artery (long thoracic artery) is a branch of the axillary artery. It supplies several structures in the axilla and anterior thoracic wall. Course The lateral thoracic artery originates from the 2nd part of the axillary artery (posterior to pectoralis minor). It courses vertically downward along the lateral border of the pectoralis minor muscle. Along its course, it provides several small branches that supply various structures within the axilla and anterior thoracic wall. It usually terminates at the level of the fifth intercostal space and forms an anastomosis with the internal thoracic artery. Adobe Stock, Licensed to TeachMeSeries Ltd Fig 1Anatomical course of the lateral thoracic artery Supply The lateral thoracic artery supplies the following structures: Axillary lymph nodes Breasts Skin of lateral thoracic wall Serratus anterior muscle Pectoralis major muscle Pectoralis minor muscle Subscapularis muscle Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Print Article Rate This Article