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Laboratory 18. Thoracic Wall
Step 5. Removal of Intercostal Muscles

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On both sides of the thoracic wall, remove the intercostal muscles from the first to the seventh intercostal spaces, as far laterally as the mid-axillary line. Take care not to damage the underlying costal pleura or internal thoracic vessels .

Identify the internal thoracic (mammary) artery and vein [cross-section] located approximately one cm lateral to the sternum. Deep to the internal thoracic vessels, also identify the transversus thoracis muscle.

Links and References:
Grant's: 1.15
Netter: 175
Rohen/Yokochi: 197