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Table 206 Arterial Supply to the Thorax continued

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The thoracic wall is also supplied by the following arteries. The first of these arises from the subclavian artery and the other three from the axillary artery:

1. The internal thoracic (mammary) artery supplies the breast and anterior thoracic wall and issues finer branches to the diaphragm and abdominal wall. Near its origin, it gives rise to the pericardiophrenic artery, which supplies the pericardium and diaphragm. As the internal thoracic artery descends alongside the sternum, it gives rise to anterior intercostal arteries that travel between the ribs and supply the ribs and intercostal muscles.

2. The thoracoacromial18 (THOR-uh-co-uh-CRO-me-ul) trunk supplies the superior shoulder and pectoral regions.

3. The lateral thoracic artery supplies the lateral thoracic wall.

4. The subscapular artery supplies the scapula, latissimus dorsi, and posterior wall of the thorax.

Vertebral a.

Thyrocervical trunk-

Costocervical trunk

Thoracoacromial trunk

Internal thoracic a.

Lateral thoracic a

Subscapular a

Anterior intercostal aa

Esophageal aa. Pericardiophrenic a.

Vertebral a Thyrocervical trunk R. subclavian a, Costocervical trunk

Internal thoracic a. Subscapular a. Lateral thoracic

Thoracoacromial trunk Anterior intercostal aa.-

Common carotid aa. L. subclavian a.

Pericardiophrenic a. Bronchial a. Posterior intercostal aa.

Esophageal aa.

R. common carotid a. L. common carotid a. L. subclavian a.

Bronchial a. Posterior intercostal aa.

Esophageal aa. Pericardiophrenic a.

Figure 20.25 Arteries Supplying the Thorax.

Saladin: Anatomy & I 20. The Circulatory System: I Text I © The McGraw-Hill

Physiology: The Unity of Blood Vessels and Companies, 2003

Form and Function, Third Circulation Edition

776 Part Four Regulation and Maintenance

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