Arch of Aorta

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- Arch of Aorta is continuation of asc aorta at sternal angle

- Begins and terminates at sternal angle

- Connects ascg & descg aorta

- Arches over root of left lung

- Situated in sup mediastinum behind manubrium

- Summit of arch reaches level of middle of manubrium

Introduction

Course

- Begins as continuation of ascg aorta behind Rt 2nd chondrosternal joint

- Passes up, back and left infront of bifurcation of trachea

- finally turns backwards & downwards behind the left bronchus n continues as descg aorta at lower border of T4 V

Course

Course

Azygos vein

TS at T4 V levelCS- superior mediastinum

Relations

Anterior & to left – Lt pleura & lung Lt phrenic N left cardiac nerves (Inf cervical cardiac br of Xth N Sup cervical cardiac br Symp trunk Lt vagus Lt Rec laryngeal N hooks upwards below arch of aorta Lt sup IC vein

Posterior & to right – Trachea with deep cardiac plexus

Oesophagus

Lt Rec laryngeal nerve

Thoracic duct

Vertebral column

Inferior

• Left bronchus• Bifurcation of pul trunk• Lig arteriosum• Left recurrent laryngeal

nerve• Sup cardiac plexus

Superior

• Brachiocephalic trunk

• Lt commom carotid A

• Lt subclavian A

• Lt brachiocephalic vein

Branches- Rt brachiocephalic trunk

– div into Rt CC & Rt SC artery

- Lt common carotid artery

- Lt subclavian artery

- Occasionally Thyroidea Ima A & Vertebral A

Brachiocephalic trunk

Lt Common Carotid

Lt Subclavian

Branches

Arch of Aorta

Development

Developmental anomalies

Applied Anatomy

Aortic knuckle

Coarctation of aortalocalised narrowing of aorta distal to Left

Subclavian origin 1.Preductal 2.Postductal3.Juxtraductal collateral circulation b/w SC & Descg

Thoracic aorta• Notching of ribs• Pulsating scapula

Aortic aneurysm – localised dilatation of aorta

Patent ductus arteriosus