1 Thyroid gland
2 Esophagus
3 Anterior jugular vein
4 Inferior thyroid vein
5 Trachea
6 Platysma
7 Sternocleidomastoid muscle
8 Internal jugular vein
9 Vagus nerve (X)
10 Phrenic nerve
11 Common carotid artery
12 Anterior scalene muscle
13 Vertebral artery
14 Spinal nerves (C5, C6, and C7)
15 External jugular vein
16 Spinal nerve root (C8)
17 Longus colli muscle
18 Transverse process of T1 vertebra
19 Middle scalene muscle
20 Intercostal muscles
21 Superior posterior margin of T1 vertebra
22 Spinal cord
23 Posterior scalene muscle
24 Iliocostalis cervicis muscle
25 First rib
26 Levator scapulae muscle
27 Intervertebral space (C7/T1)
28 Serratus posterior superior muscle
29 Semispinalis capitis muscle
30 Splenius cervicis muscle
31 Spinalis cervicis muscle and multifidus muscle
32 Splenius capitis muscle
33 Semispinalis cervicis muscle
34 Trapezius muscle
35 Rhomboid minor muscle
36 Interspinous ligament
2 Esophagus
3 Anterior jugular vein
4 Inferior thyroid vein
5 Trachea
6 Platysma
7 Sternocleidomastoid muscle
8 Internal jugular vein
9 Vagus nerve (X)
10 Phrenic nerve
11 Common carotid artery
12 Anterior scalene muscle
13 Vertebral artery
14 Spinal nerves (C5, C6, and C7)
15 External jugular vein
16 Spinal nerve root (C8)
17 Longus colli muscle
18 Transverse process of T1 vertebra
19 Middle scalene muscle
20 Intercostal muscles
21 Superior posterior margin of T1 vertebra
22 Spinal cord
23 Posterior scalene muscle
24 Iliocostalis cervicis muscle
25 First rib
26 Levator scapulae muscle
27 Intervertebral space (C7/T1)
28 Serratus posterior superior muscle
29 Semispinalis capitis muscle
30 Splenius cervicis muscle
31 Spinalis cervicis muscle and multifidus muscle
32 Splenius capitis muscle
33 Semispinalis cervicis muscle
34 Trapezius muscle
35 Rhomboid minor muscle
36 Interspinous ligament