Dissection of breast and anterolateral thoracic wall

Intercostal muscles, anterior view

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Image #115-5

Dissection of breast and anterolateral thoracic wall

Intercostal muscles, anterior view

The external intercostal muscles have been removed from the first and second interspaces anteriorly to expose the internal intercostal muscles. A third, innermost layer of muscle has not been shown in this dissection. For a view of this layer reference should be made to 115-7.

1. Clavicle
2. Pectoralis major muscle
3. Mammary body
4. External abdominal oblique muscle
5. Rectus abdominis muscle
6. Vagus nerve left
7. Trachea
8. Internal jugular vein (at junction with subclavian vein)
9. Common carotid artery
10. Rib II
11. Sternum
12. Internal intercostal muscle
13. External intercostal muscle
14. External intercostal membrane
15. Costochondral junction
16. Sheath of rectus abdominis muscle
17. Linea alba