Penetrating injury
at the left sternal border in the 4th ICS (level of nipple) will pass through:
- skin and subcutis
- P. major muscle
- External intercostal membrane
- Internal intercostal muscle
- Internal thoracic artery and veins
- Transversus thoracis muscle
- Parietal pleura
- Pericardium
- Right ventricular myocardium