1 — Scalenus posterior; Posterior scalene; 2 — Omohyoid, inferior belly; 3 — Levator scapulae; 4 — Longus colli; 5 — Longus capitis; 6 — Semispinalis capitis; 7 — Longissimus capitis; 8 — Splenius capitis; 9 — Sternocleidomastoid; 10 — Digastric, anterior belly; 11 — Stylohyoid; 12 — Masseter; 13 — Inferior constrictor; 14 — Hyoglossus; 15 — Mylohyoid; 16 — Thyrohyoid; 17 — Hyoid bone; 18 — Sternohyoid; 19 — Omohyoid, superior belly; 20 — Sternothyroid; 21 — Thyroid gland; 22 — Tendinous intersection; 23 — Oesophagus; 24 — Trachea; 25 — Clavicle; 26 — First rib [I]; 27 — Scalenus anterior; Anterior scalene; 28 — Scalenus medius; Middle scalene