aortic isthmus

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aortic isthmus

[TA]
a slight constriction of the aorta immediately distal to the left subclavian artery at the point of attachment of the ductus arteriosus.
Synonym(s): isthmus aortae [TA], isthmus of aorta
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aortic isthmus

A constriction in the fetal aorta between the ductus arteriosus and the left subclavian artery. The condition sometimes persists into adulthood.
See also: isthmus
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