- Third branch off the Subclavian Artery
- 2cm lateral to the sternal margin
- In neurovascular plane between the internal intercostal muscles and costal cartilages anteriorly, and the transversus thoracis muscle posteriorly
- At the level of the 1st rib, it is crossed anteriorly by the Phrenic Nerve
- Branches
- Anterior Intercostal Arteries
- Pericardiophrenic artery
- Perforating cutaneous branches
- Bifuraces at 6th -7th costal cartilage
