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Laboratory 26. Cervical Viscera
Step 6. The Internal Thoracic Artery

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Identify the internal thoracic artery as it originates from the inferior aspect of the subclavian artery, opposite the origin of the subclavian trunk. Follow the internal thoracic artery inferiorly as it passes through the superior thoracic aperture to the anterior aspect of the thoracic wall.

Links and References:
Grant's: 8.46
Netter: 28
Rohen/Yokochi: 165