Sympathetic trunk of the neck basilar part of occipital bone ngus capit cial layer of deep mastoid process inverse process of atlas Pretracheal fascia lesser occipital nerve great auricular nerve vertebral artery Sternohyoid m transverse cutaneous norvo scalenus medius longus cervicis phrenic nerve Sternocleidomastoid m midd o cervical sympathetic ganglion upper trunk of Omohyoid m brachial plexus upper trunk of brachial plexus inferior cervical horacic duct Sympathetic trunk sympathetic ganglion ansa subclavia perficial cervical artery corrected costocervical trunk thyrocervical trunk vertebral artery suprascapular artery scalenus anterior subclavian artery laryngeal nerve external jugular vein subclavian vein Trapezius m internal thoracic artery Cervical vertebra internal jugular vein right brachiocephalic vein left recurrent laryngeal nerve trachea sternothyroidcorrected Sympathetic trunk of the neck