1 Mastoid process (Petrous part of temporal bone)
2 Foramen magnum
3 Suboccipital venous plexus
4 Mastoid process
5 Atlas (posterior arch)
6 Digastric muscle (posterior belly)
7 Vertebral artery
8 Obliquus capitis superior muscle
9 Obliquus capitis inferior muscle
10 Splenius capitis muscle
11 Longissimus capitis muscle
12 Spinous process (C2)
13 Levator scapulae muscle
14 Sternocleidomastoid muscle
15 Splenius cervicis muscle
16 Deep cervical artery and vein
17 Trapezius muscle
18 Interspinous ligaments
19 Deep cervical vein
20 Multifidus muscle
21 Brachial plexus
22 Spinous process (C7)
23 Costal process
24 First rib
25 Lung (right)
26 Spinal cord
2 Foramen magnum
3 Suboccipital venous plexus
4 Mastoid process
5 Atlas (posterior arch)
6 Digastric muscle (posterior belly)
7 Vertebral artery
8 Obliquus capitis superior muscle
9 Obliquus capitis inferior muscle
10 Splenius capitis muscle
11 Longissimus capitis muscle
12 Spinous process (C2)
13 Levator scapulae muscle
14 Sternocleidomastoid muscle
15 Splenius cervicis muscle
16 Deep cervical artery and vein
17 Trapezius muscle
18 Interspinous ligaments
19 Deep cervical vein
20 Multifidus muscle
21 Brachial plexus
22 Spinous process (C7)
23 Costal process
24 First rib
25 Lung (right)
26 Spinal cord