Figure 53-8 The structures in or near the anterior median line of the neck: (1) symphysis menti, (2) diaphragma oris (mylohyoid muscles) crossed by the digastric muscles, (3) hyoid bone, (4) median thyrohyoid ligament, (5) laryngeal prominence of the thyroid cartilage (overlying the glottis), (6) cricothyroid ligament, (7) arch of the cricoid cartilage, (8) cricotracheal ligament, (9) trachea and isthmus of the thyroid gland, (10) inferior thyroid veins forming a plexus, (11) jugular arch uniting the right and left jugular veins, (12) thymus (chiefly in childhood) and occasionally part of the brachiocephalic trunk or of the left brachiocephalic vein, and (13) jugular notch of the manubrium sterni. The infrahyoid muscles are not shown here.