<prompt> The anterior triangle occupies the side of the neck in front of sternomastoid muscle. Each triangle presents boundaries in front:Anterior median line of the neck extending from symphysis menti to suprasternal notch.The midline of the neckMidline of the neck up to the sternoclavicular jointPosterior border of thyroid gland  <response>: Boundaries of anterior triangle are:Anteriorly by the median plane.Posteriorly by the sternocleidomastoid.Superiorly by the base of the mandible and by a line joining the angle ofmandible to the mastoid process.The apex of the triangle lies above the manubrium sterni 