<prompt> DEEP PETROSAL nerve arises fromFacial nerveGlossopharyngeal nervePlexus around internal carotid aeryMandibullar nerve  <response>: The deep petrosal nerve, sympathetic in nature is a branch of the sympathetic plexus around the internal carotid aery. It contains postganglionic fibres from the superior cervical sympathetic ganglion. The nerve joins the greater petrosal nerve to form the nerve of the pterygoid canal. The sympathetic fibres in it are distributed through the branches of the pterygopalatine ganglion. Ref: BD Chaurasias HUMAN ANATOMY, Volume 3, 4th edition. 