1
.
| Sternocleidomastoid muscle (cut off) |
2
.
| Manubrium of sternum |
3
.
| Pectoralis major muscle |
4
.
| Anterior cutaneous branch intercostal nerve I |
5
.
| Sternocostal ligament (pointer crosses sternal angle) |
6
.
| Perforating branch internal thoracic artery |
7
.
| Sternocostal joint III |
8
.
| Sternocostal ligament (a delicate band in this specimen) |
9
.
| Thyroid gland (right lobe) |
10
.
| Trachea |
11
.
| Left pointer: Thymus Right pointer: Common carotid artery |
12
.
| Carotid sheath |
13
.
| Left subclavian artery |
14
.
| Anterior scalene muscle (cut off) |
15
.
| Upper pointer: Internal thoracic artery (pointer near origin) Lower pointer: Costoclavicular ligament (cut off) |
16
.
| Position of sternocostal joint I |
17
.
| Costal pleura |
18
.
| External intercostal muscle |
19
.
| Sternal lymph nodes |
20
.
| Internal intercostal muscle |
21
.
| Intercostal nerve II |
22
.
| Internal thoracic artery and vein |
23
.
| Rib III |
24
.
| Anterior intercostal branch internal thoracic artery |
25
.
| Upper pointer: Costochondral junction Lower pointer: Costal cartilage III (note that a portion of the cartilage has been removed to allow the sternocostal joint to be opened) |