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| Subclavian artery | |
|---|---|
| Name | Subclavian artery |
| Latin | Arteria subclavia |
| System | Cardiovascular system |
| Supplies | Upper limb, thorax, neck, brainstem |
Subclavian artery The subclavian artery is a major paired artery supplying the upper limb, thorax, neck and, via branches, parts of the brainstem and spinal cord. Originating asymmetrically from the aortic arch and brachiocephalic trunk, it gives rise to multiple branches that contribute to collateral circulation with the vertebral, internal thoracic and thyrocervical systems. Its course, relations and variants are clinically important in vascular surgery, neurology and trauma care.
The right subclavian artery typically arises from the Brachiocephalic trunk while the left arises directly from the Aortic arch; both travel laterally beneath the clavicle toward the axilla. Key anatomical relations include the Scalene muscles complex, the Brachial plexus, the Thoracic inlet boundaries and the Clavicle. The artery is classically divided into three parts relative to the anterior scalene muscle: medial, posterior and lateral segments, each with distinct adjacent structures such as the Internal jugular vein, Phrenic nerve and Thoracic duct. Its termination as the axillary artery occurs at the lateral border of the first rib near the Axilla.
Major branches include the vertebral artery, internal thoracic artery and thyrocervical trunk; the costocervical trunk and dorsal scapular artery are also common contributors. The vertebral branch ascends through foramina transversaria of cervical vertebrae to the Basilar artery and Circle of Willis. The internal thoracic artery descends behind the sternum supplying anterior intercostal branches linked to the Intercostal arteries. The thyrocervical trunk subdivides to form the inferior thyroid artery, transverse cervical artery and suprascapular artery, anastomosing with branches from the Axillary artery and Thoracoacromial artery.
Anatomic variations include an aberrant right subclavian artery (arteria lusoria) arising distal to the left subclavian from the aortic arch, potentially compressing the Esophagus or Trachea and associated with Dysphagia lusoria. Other variants include separate origins of the vertebral artery from the aortic arch or common origin of the brachiocephalic and left common carotid as a Bovine arch configuration. The presence, size or origin of the dorsal scapular and transverse cervical arteries may vary, impacting reconstructive flap planning and neck dissections performed by surgeons from institutions such as Mayo Clinic or Johns Hopkins Hospital.
Embryologically, the subclavian arteries derive from the seventh intersegmental arteries and portions of the dorsal aorta influenced by neural crest–derived mesenchyme and signals from morphogens studied by investigators at Harvard Medical School and Stanford University. Abnormal regression or persistence of aortic arch segments yields variants such as the aberrant right subclavian, linked historically to descriptions by clinicians in the 19th century and modernized through imaging advances pioneered at centers like Massachusetts General Hospital.
The subclavian artery supplies arterial blood to the upper limb, contributes vertebrobasilar flow to the posterior circulation of the brain including the Cerebellum and Brainstem, and provides thoracic wall perfusion via the internal thoracic branches. Collateral networks involving the subclavian, axillary and intercostal systems support perfusion during occlusive disease and are relevant to cerebrovascular reserve assessed in cases managed at facilities such as Cleveland Clinic.
Occlusive disease, atherosclerosis, traumatic injury and thoracic outlet compression can compromise subclavian flow, leading to upper limb ischemia, vertebrobasilar insufficiency and subclavian steal syndrome. Subclavian steal, described in vascular literature from centers including Guy's Hospital and Addenbrooke's Hospital, involves retrograde vertebral flow and symptoms like dizziness, syncope and arm claudication. Iatrogenic injury can occur during central venous catheterization via the subclavian approach or during clavicular fixation procedures performed in trauma centers such as Royal London Hospital.
Noninvasive modalities include duplex ultrasonography, computed tomography angiography (CTA) and magnetic resonance angiography (MRA) widely performed at institutions like Mount Sinai Hospital and UCLA Medical Center. Digital subtraction angiography (DSA) remains the gold standard in interventional suites at tertiary centers including UCSF Medical Center for detailed lumenography and planning. Imaging identifies stenosis, occlusion, aneurysm, dissection and congenital anomalies such as arteria lusoria, guiding management decisions.
Treatment options range from open surgical bypass grafting, endarterectomy and transposition procedures to percutaneous transluminal angioplasty with stenting; centers of excellence at institutions like Toronto General Hospital and Karolinska University Hospital have published outcomes comparing techniques. Thoracic outlet decompression, first rib resection and scalenectomy address compressive etiologies, while hybrid approaches combine endovascular stent placement and surgical bypass for complex lesions. Management choice depends on lesion anatomy, patient comorbidity and local expertise at referral centers such as Imperial College Healthcare NHS Trust.
Category:Arteries of the thorax