Answer:
Here are the labels:
6. Zygomatic bone
7. Vomer
8. Mandible
9. Maxilla
18. Sternum
19. Costal cartilage
20. True ribs
21. False ribs
22. Floating ribs
Step-by-step explanation:
- The skull comprises the 8 cranial bones that house and protect the brain and 14 facial bones that protect the sensitive organs such as eyes, nose and mouth.
- Out of the 14 facial bones, the mandible, maxilla, zygomatic and vomer along with the frontal bone are the primary bones of the skull.
- The rib cage comprises of 12 pairs of ribs connected to the sternum, the main bone that anchors the rib cage, through the costal cartilage.
- The ribs numbered 1 to 7 are called true ribs because costal cartilage connects these bones directly to the sternum.
- The ribs 8 to 12 are classified as false ribs because they are not directly connected to the sternum.
- The last two ribs 11 and 12 are called floating ribs because they do not connect to the sternum at all.