<prompt> Deep petrosal nerve is formed from -Svmathetic plexus around carotidFacial nerveGlossopharyngealInternal carotid plexus  <response>: Ans. is ai.e., Symathetic plexus around carotid o Deep petorsai nerve sympathetic is a branch of the sympathetic plexus around the internal carotid artery. It contains the postganglionic fibres from the superior cervical sympathetic ganglion.lt joins the greater petrosal nerve to form the nerve of the pterygoid canal. 