2. Thyrohyoid membrane

3. Thyroid cartilage

4. Cricoid cartilage

5. Thyroid gland

6. Trachea

7. Brachiocephalic (innominate) vein

8. Superior vena cava

9. Aorta

10.  R. Common carotid artery

11.  R. Auricle

12.  L. Auricle

13.  Diaphragm