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What is Main pa of pulmonary aery is a derivative of which of the following branchial arch? and explain in detail?
The ventral pa of the 6th arch forms the main pa of the pulmonary aery. The dorsal pa on the left side persist as ductus aeriosus which closes after bih and remains as ligamentum aeriosum. The dorsal pa on the right side disappears. Vascular elements of branchial arches:First arch: Maxillary aerySecond arch: Stapedial aeryThird arch: Common carotid and internal carotid aeryFouh arch: On the right side it forms the first pa of subclan aery and on the left side it forms the main pa of arch of aoaRef: Bedside Clinics In Surgery By M.L. Saha page 363.