The image below shows underneath the jaw and throat with the skin removed. Look at how many muscles there are and h0w many different directions the fibers go. Many of them are tethered by the hyoid bone. It’s a horseshoe shaped bone anchored by muscles from the front, the back and below. It aids in tongue movement and swallowing.
It’s rare, but some people have their jaws mapped as solid bone underneath. Can you imagine? It would explain why they tilt their head back to open their mouths rather than lowering their jaw.
Tomorrow, we are going to redefine how we think of the neck and connect it to the arms. I need to get some sleep for this one.