Knowing the anatomy of the head will help you understand the basic forms beneath the skin. Listing the names of the points on the skull isn’t practical for our purpose here. Instead, I’ve placed a dot at each point of the skull that you should be aware of when you draw. These points make an impression on the surface, and, if you include them, your drawings will be more accurate.
The diagram directly below includes the temporalis (on the temple) and the masseter (on the jaw) muscles. These muscles allow you to chew by pulling the jawbone.
The illustration below is a general (though not complete) diagram of the facial muscles so you can ...