Subclavian Artery Anatomy - pediagenosis
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Wednesday, June 16, 2021

Subclavian Artery Anatomy

Subclavian Artery Anatomy

Subclavian Artery Anatomy

1. Vertebral artery

2. Costocervical trunk

3. Supreme intercostal artery

4. Internal thoracic artery

5. Suprascapular artery

6. Thyrocervical trunk

7. Common carotid artery

8. Transverse cervical artery

9. Inferior thyroid artery

Comment: The subclavian artery is divided into 3 parts relative to the anterior scalene muscle. The 1st part is medial to the muscle, the 2nd is posterior, and the 3rd is lateral. Branches of the subclavian include the vertebral and internal thoracic (mammary) arteries, thyrocervical and costocervical trunks, and dorsal scapular artery.

The vertebral artery ascends through the C6-1 transverse foramina and enters the foramen magnum. The internal thoracic descends parasternally. The thyrocervical trunk supplies the thyroid gland (inferior thyroid), the lower region of the neck (transverse cervical), and the dorsal scapular region (suprascapular). The costocervical trunk supplies the deep neck (deep cervical) and several intercostal spaces (supreme intercostal). The dorsal scapular branch is inconstant; it may arise from the transverse cervical artery.

Clinical: The branches of the subclavian artery anastomose with branches of the axillary artery around the shoulder joint, with branches of the thoracic aorta (intercostal branches) along the rib cage, across the midline of the neck and face via branches from both external carotid arteries, and with the internal carotid arteries and the vertebral branches (circle of Willis on the brainstem). These interconnections are important if the vasculature in 1 region is compromised.

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