1 Mastoid process
2 Cisterna magna
3 Deep cervical vein
4 Obliquus capitis superior muscle
5 Atlas (posterior arch)
6 Longissimus capitis muscle
7 Spinous process of axis (C2)
8 Splenius capitis muscle
9 Deep cervical vein
10 Rectus capitis posterior major muscle
11 Semispinalis cervicis muscle
12 Sternocleidomastoid muscle
13 Longissimus cervicis muscle
14 Obliquus capitis inferior muscle
15 Levator scapulae muscle
16 Semispinalis capitis muscle
17 Splenius cervicis muscle
18 Supraspinous and interspinous ligaments
19 Trapezius muscle
20 Spinous process (C7)
21 Transverse process (T2)
22 Second rib
23 Supraspinatus muscle
24 Vertebra (T2)
25 Lung (right)
26 Spinal cord
27 Transverse process (T4)
28 Vertebra (T4)