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