The carotid triangle (or superior carotid triangle) is a portion of the anterior triangle of the neck.Sternocleidomastoid muscleMuscles of the neck. Anterior view.The triangles of the neck. (Anterior triangles to the left; posterior triangles to the right. Suprahyoid labeled at left.) The carotid triangle (or superior carotid triangle) is a portion of the anterior triangle of the neck.