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
Table 2: Morophologic variants of sternal blood supply.