As far as Contact C.A.R.E. is concerned, skull shape is a mirror of the skeletal shape of your horse. The skull is hugely important in the function it serves biomechanically, because the actual shape of the skull centralizes the multiple movements of the skeleton. 

But what happens when a Flinchlock®  interferes with natural function? Lets take a look...
The diagram to the right shows a topographical outline of the horses skull. The sections that have been coloured represent the skeletal balance points of the body. You can see that:
  • The horses skull is balanced by the tip of the skull (around the nose area).
  • The horses spine is balanced by the length of the skull.
  • The front legs are balanced by the upper jaw.
  • And hind legs are balanced by the lower jaw.
  • The horses sacrum is balanced in the area above the horses eyes.
  • The hollow of the eye sockets corresponds to the hollow just after the ribs, and before the pelvis starts.
In the case of your horse, this means that any impact trauma to either the skull, or body, will create a corresponding pressure signature in one or the other. These can often be seen if you know what to look for. 
© Image copyright Dale Speedy 2015 and ConTact C.A.R.E - Used with permission

When it comes to working cranial correspondences...

There are three sayings I picked up from Dale Speedy that beautifully illustrate the power that cranial injuries have over the body.
  • As above, so below.
  • As in front, so behind.
  • For every outside force imposed on the skeleton, there is an equal and predictable reaction that occurs.
This means if your horse has taken an impact injury to its skull, it will create tension in the corresponding biomechanical carriage point of the body. Here's an example:

I was called out to a horse that had been securely tied up in the float, but somewhere on the journey he managed to bang his head, just above the eye. From that single event everything felt wrong, lead changes were difficult, the horse felt twisted, and movement was laboured. Why was this the case? Because that horses hindquarters now had to carry the injury in the skull, before they could carry their own movement. By releasing the skull from its Flinchlocked state, normal function could return - and the challenges the owner had noticed simply stopped.

This is cranial biomechanics in action...

Its pretty easy to see where he took the knock on the body. What most people would miss is the corresponding ruffling and patch of missing hair on his head. By releasing the Flinchlocked skull pressure, this horse immediately became more comfortable.
The depression in this horses chest was noticeable to everyone, what was less obvious was the twist through the skull as seen in the second picture, and the indentation on the same side of the horses face. All mirroring the impact trauma this horse had sustained at some point in its life.
In the case of this miniature, the swollen knees highlighted in the first picture could also be seen in the swelling of their cranial counterpart - the upper jaw. During the course of her treatment it turned out she had impacted her knees, and skull simultaneously.
The rub marks on the wither due to a heavily pressurized core as a result of a poorly fitted saddle, are mirrored on the bridge of this horses skull. The result is shortness of breath, tightening of the neck and a horse that feels stuck to the ground. 
One can easily see the sway in this miniatures back, mirrored by the dish in its skull shape. Another wonderful example of body shape conforming to skull shape.
The dent in this horses sacrum is clearly carried by its cranial counterpart. Although not entirely visible in the image there is an actual dent in the middle of this horses forehead, with swelling present in the surrounding area. Horses that suffer from this cranial Flinchlock contortion are typically not using their jaw correctly, suffer from TMJ problems and hold their hindquarters in permanent engagement. 
Any skull impact will create tension in the body.
And skeletal sensory shock in the body will result in a change of your horses head angle, and attitude.
But if both are hit simultaneously, then you have an injury that will contort the entire shape of your horse. 
Over time, internal pressure builds, pain increases, and greater contortion happens.