Dissection of breast and anterolateral thoracic wall

Vessels and nerves of first and second left intercostal spaces; Internal thoracic vessels; sternal lymph nodes; sternocostal joint

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Image #115-6

Dissection of breast and anterolateral thoracic wall

Vessels and nerves of first and second left intercostal spaces; Internal thoracic vessels; sternal lymph nodes; sternocostal joint

The costal part of the parietal pleura has been exposed in the anterior portions of the first and second intercostal spaces.

1. Sternocleidomastoid muscle (cut off)
2. Manubrium of sternum
3. Pectoralis major muscle
4. Anterior cutaneous branch intercostal nerve I
5. Sternocostal ligament (pointer crosses sternal angle)
6. Perforating branch internal thoracic artery
7. Sternocostal joint III
8. Sternocostal ligament (a delicate band in this specimen)
9. Thyroid gland (right lobe)
10. Trachea
11. Left pointer: Thymus Right pointer: Common carotid artery
12. Carotid sheath
13. Left subclavian artery
14. Anterior scalene muscle (cut off)
15. Upper pointer: Internal thoracic artery (pointer near origin) Lower pointer: Costoclavicular ligament (cut off)
16. Position of sternocostal joint I
17. Costal pleura
18. External intercostal muscle
19. Sternal lymph nodes
20. Internal intercostal muscle
21. Intercostal nerve II
22. Internal thoracic artery and vein
23. Rib III
24. Anterior intercostal branch internal thoracic artery
25. Upper pointer: Costochondral junction Lower pointer: Costal cartilage III (note that a portion of the cartilage has been removed to allow the sternocostal joint to be opened)