Answer :
Final answer:
The skull consists of cranial and facial bones but not all associated bones are facial bones; the mandible is a notable exception. Sesamoid bones, like the patella, and irregular bones, such as the vertebrae, illustrate other bone types in the human skeleton.
Explanation:
The skull consists of 22 bones that are broadly categorized into cranial bones and facial bones. The facial bones are those fourteen bones that support the facial structures, form the upper and lower jaws and the hard palate. However, not all bones associated with the skull are considered facial bones. The mandible is one unique bone that is often thought of as a facial bone but is technically not classified as such. Instead, the mandible is a part of the skull but is unique due to its movement, which is unlike the other facial bones that are fused together and do not move.
Sesamoid bones are another category and are different from regular bones, being small and round, forming in tendons where there's high pressure. The most commonly known sesamoid bone is the patella (kneecap). While it's not a facial bone, it provides insight into the varying types and classifications of bones in the human skeleton.
Irregular bones, such as the vertebrae, have complex shapes and are classified differently from the bones of the cranial and facial subsets. These irregular bones can occur in various locations, including within the structures of the face, but their complex shapes and functions preclude them from being strictly classified as facial bones.
