arch of aorta
DESCRIPTION
Rishi PokhrelTRANSCRIPT
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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
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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
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Course
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Course
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Azygos vein
TS at T4 V levelCS- superior mediastinum
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Relations
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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
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Posterior & to right – Trachea with deep cardiac plexus
Oesophagus
Lt Rec laryngeal nerve
Thoracic duct
Vertebral column
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Inferior
• Left bronchus• Bifurcation of pul trunk• Lig arteriosum• Left recurrent laryngeal
nerve• Sup cardiac plexus
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Superior
• Brachiocephalic trunk
• Lt commom carotid A
• Lt subclavian A
• Lt brachiocephalic vein
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Branches- Rt brachiocephalic trunk
– div into Rt CC & Rt SC artery
- Lt common carotid artery
- Lt subclavian artery
- Occasionally Thyroidea Ima A & Vertebral A
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Brachiocephalic trunk
Lt Common Carotid
Lt Subclavian
Branches
Arch of Aorta
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Development
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Developmental anomalies
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Applied Anatomy
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Aortic knuckle
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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
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Aortic aneurysm – localised dilatation of aorta
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Patent ductus arteriosus
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