Embryological dorsal aoa forms:

Embryological dorsal aoa forms distal pa of descending aoa. Proximal pa of descending aoa develops from Left dorsal aoa distal to attachment of fouh arch aery and Distal pa from fused dorsal aoae forming single median aery. Ascending aoa and pulmonary trunk develops from truncus aeriosus (a pa of hea tube). Arch of aoa develops from 4th arch aery. Common carotid aery develop from aoic arch III.