All are true about branches of aoa are all except?

Ans. is 'd' i.e., Coronary aeries arise from arch of aoa Arch of aoa It lies in the superior mediastinum, behind the lower half of manubrium sterni. It begins as a continuation of ascending aoa at the level of upper border of right second sternocostal junction (sternal angle) and continues as descending aoa on the left side at lower border of T4 veebra. Thus begining and end of arch of aoa are at the same level, although it begins anteriorly and ends posteriorly. Arch of aoa has following features :- i) Left surface is crossed by 4 nerves from anterior to posterior : left phrenic, superior cervical cardiac branch of left sympathetic trunk, inferior cervical cardiac branch of left vagus, and left vagus nerve. ii) Left recurrent laryngeal nerve winds round the arch. iii) Three branches arise from convexity :- brachiocephalic trunk, left common carotid aery and left subclan aery.