1 — Spinous process; 2 — Spinal cord; 3 — Thoracic vertebra [TI]; 4 — Spinal nerve; 5 — Longus colli; 6 — Scalenus medius; Middle scalene; 7 — Scalenus posterior; Posterior scalene; 8 — Brachial plexus; 9 — Scalenus anterior; Anterior scalene; 10 — Clavicle; 11 — Omohyoid; 12 — Oesophagus; 13 — Inferior thyroid vein; 14 — Thyroid gland, lobe; 15 — Sternocleidomastoid; 16 — Sternothyroid; 17 — Sternohyoid; 18 — Anterior jugular vein; 19 — Trachea; 20 — Vagus nerve [X]; 21 — Internal jugular vein; 22 — Lateral cervical nucleus; 23 — External jugular vein; 24 — Common carotid artery; 25 — Ascending cervical artery; 26 — Recurrent laryngeal nerve; 27 — Vertebral vein; 28 — Vertebral artery; 29 — First rib [I]; 30 — Supraspinatus; 31 — Scapula; 32 — Trapezius; 33 — Levator scapulae