Which of the following represent the commonest variation in the aeries arising from the arch of aoa?

Most common anomaly of the aoic arch seen in 10-20% individuals is characterized by the origin of the left common carotid aery from the brachiocephalic (innominate) trunk. Other common anomalies include: A four vessel arch with separate origins for the right common carotid and right subclan aeries (2.5%), Origin of the left veebral aery directly from a four vessel aoic arch typically between the ostia of the left common carotid and subclan aeries ( 2.4- 5.8%). Ref: Gray&;s anatomy text book of anatomy BD chaurasia 21st Ed.