Is the lower jaw considered a flat bone?
Since this is not my area of expertise, I searched Google under the key words "flat bones" to get this source:
Flat bones of the skull
The bones of your skull surround and protect your brain and also provide support to your face. Many of the bones of your skull are flat bones. These include:
Frontal bone. This bone forms your forehead and the upper portion of your eye sockets.
Parietal bones. You have two parietal bones on either side of your head. They form the top and sides of your skull.
Occipital bone. This bone forms the back of your skull. It has an opening near the bottom that allows your spinal cord to meet your brain.
Nasal bones. You have two nasal bones that form the bridge of your nose. They form the bridge of your nose.
Lacrimal bones. You also have two small lacrimal bones that form part of your eye socket.
Vomer bone. This bone forms your nasal septum, the space between your nostrils.
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
http://www.hackcollege.com/blog/2011/11/23/infographic-get-more-out-of-google.html