The ligamentum arteriosum is a fibrous band that runs between the superior surface of the origin of the left pulmonary artery and the inferior surface of the arch of the aorta. It passes superolaterally from inferior to superior attachments; the latter is about the level of the origin of the left subclavian artery from the aorta.
Its relations include:
The ligamentum arteriosum represents the remnant of the fetal ductus arteriosus.
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