<prompt> Contents of posterior triangle of neckOccipital artery, spinal accessory nerve, hypoglossal, ascending pharyngeal arteryOccipital artery, lesser occipital nerve, subclavian artery, spinal accessory nerveOccipital artery, spinal accessory nerve, subclavian artery, hypoglossal nerveOccipital artery, Lesser occipital nerve, ascending pharyngeal artery, vagus nerve  <response>: Contents of posterior triangle of neck :Occipital artery.Spinal accessory nerve.Subclavian vessels.Trunks of brachial plexus.Great auricular nerve, lesser occipital nerve, supraclavicular nerve, transverse cutaneous nerve.External jugular vein. 