I was going through my older drawings and came across this. It's quite comical but its a dromaeosaur head midway through dissection. The skin has been peeled off to reveal the jaw adductor muscles, jaw depressor muscle, parts of the neck muscles, and trachea. I got this idea from my own numerous dissections of bird heads. Minus the fact that this looks like a dinosaur, the initial phases of dissections in bird heads also look something like this...Even in birds there really isn't much of a subdermal layer of muscles, except some really thin sheets that presumably control the feathers. But other than that, archosaurs don't have facial muscles seen in mammals and the skin is pretty much attached directly to the skull and mandibles in most parts, especially the rostrum.
The jaw adductors visible in this phase are the M. adductor mandibulae externus (MAME) superficialis (MAMES) filling the lateral temporal fenestra, MAME medialis (MAMEM) occupying the supratemporal fenestra, and M. pterygoideus (MPT) attaching on the ventral/medial side of the mandible and inserting/originating at the pterygoideus/palatine/quadrate on the upper jaw. The M. depressor mandibulae (MDM) is the slim body of muscle attaching on the back of the skull down to the retroarticular process if there is one or the posterior edge of the mandible.
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