GENERAL HISTOLOGY

Detailed explanation-1: -The aorta then passes posteriorly and to the left, anterior to the trachea, and arches over left main bronchus and left pulmonary artery, and reaches to the left side of the T4 vertebral body.

Detailed explanation-2: -Left aortic arch The ductus remains patent on the left side and connects the aorta distal to the left subclavian artery origin to the proximal left pulmonary artery. The descending aorta is usually on the same side as is the aortic arch, and it is due to the persistence of ipsilateral dorsal aorta (23).