This is part of the hyopharynx. It forms the back wall of the throat from the level of the hyoid bone to the postcricoid region. It’s muscular walls are formed by the middle constrictor muscles which are attached anteriorly to the hyoid bone and stylohoid ligament and the thyrohyoid inferior constrictors which are attached anteriorly to the thyroid cartilage and cricoid cartilages forming a sling around the laryngopharynx.