I — Subclavian artery; 2 — Recurrent laryngeal nerve; 3 — Brachiocephalic trunk; 4 — Superior vena cava; 5 — Sympathetic trunk, superior cervical ganglion; 6 — Common carotid artery; 7 — Cervical nerve [CIV]; 8 — Brachial plexus; 9 — Vagus nerve [X]; 10 — Internal jugular vein;
II — External carotid artery; 12 — Internal carotid artery; 13 — Digastric, anterior belly; 14 — Mylohyoid; 15 — Digastric, posterior belly; 16 — Submandibular gland; 17 — Hyoid bone, lesser horn; 18 — Facial artery; 19 — Hypoglossal nerve [XII]; 20 — Accessory nerve [XI]
