| Type 1 |
Sternocostal branch with both sternal and perforating artery communicating with anterior intercostal artery |
| Type 2 |
Sternocostal branch with perforating and anterior intercostal artery arising from common artery |
| Type 3 |
Sternal-perforating branch not connected to the anterior intercostal artery |
| Type 4 |
All sternal branches arise as separate arteries from common artery |
