Brachiocephalic trunk


    • The first and largest branch of the arch

    • Arises opposite the centre of the manubrium sterni

    • In front of the trachea

    • As it ascends it inclines to  the right to reach the posterior aspect of the right sternoclavicular joint.

    • There if bifurcates into right subclavian and right common carotid arteries.

    • Between it and the manubrium are the left brachiocephalic vein, thymic remnants and lower attachments of sternothyroid and sternohyoid.

    • Upper portion is medial to the right brachiocephalic vein

    • The right vagus is lateral to it  then passes behind it to reach the right side oft he trachea.