Intercostal Arteries

Description

Posterior thoracic anatomy is presented with the rib cage and vertebral column as the bony framework and the paired intercostal arteries traced along each intercostal space. Segmental vessels course laterally from the posterior thoracic wall, hugging the inferior margin of each rib within the costal groove, where they travel with the intercostal veins and intercostal nerves as a neurovascular bundle. Proximally, the intercostal arteries align with the thoracic vertebrae near their origins from the thoracic aorta, while more superior spaces relate to subclavian system contributions. Clear laterality. Posterior emphasis matters when teaching how the intercostal spaces are supplied and why the neurovascular bundle is approached from the superior border of a rib during procedures. Tube thoracostomy, intercostal nerve block, and thoracentesis all risk lacerating the intercostal artery if the needle or trocar tracks too close to the inferior rib margin, and posteriorly the vessel can be larger and less forgiving. This view also supports understanding collateral flow and bleeding patterns in rib fractures, where sharp posterior rib fragments may injure the intercostal vessels and produce a hemothorax. Use this artwork for gross anatomy lab teaching on thoracic wall vasculature, for surgical education materials covering safe intercostal space access, or for radiology and trauma publications that correlate rib fracture levels with expected vascular injury. It also fits patient-facing diagrams that explain why posterior rib pain can accompany vascular and neural irritation after blunt chest trauma. Anatomical accuracy verified by SciePro's Medical Advisory Board.