<prompt> Nerve to pterygoid canal is formed fromDeep petrosal nerve greater petrosal nerveFacial nerveLesser superficial petrosal nerveLesser petrosal nerve  <response>: In the anterior pa of the foramen lacerum, the greater petrosal nerve unites with the deep petrosal nerve to form the nerve of the pterygoid canal which leaves the foramen by entering the pterygoid canal in the anterior wall of the foramen lacerum. Ref: BD Chaurasias HUMAN ANATOMY, Volume 3, 4th edition. 