Evolution of Movement

I'm going to start this discussion--is that a correct thing to say in a blog?--with the evolution of movement, from fish to mammal, with some talk about bipeds but mostly about quadrupeds. Then I'll talk a little about my thoughts on how movement deviations, or those things we see in our animal clients that aren't right, and what they may mean from a therapeutic intervention perspective.
Let's start.
Evolution has a interesting characteristic--it doesn't like to replace things that are working with new features, unlike computer programs! What this means is that potentially all of evolutions movements, or perhaps better put, all of the movements that were experienced in evolution are still present in the body, not removed but built on.
I'm suggesting that there are 4 movements that are in a mammalian body:
1. The notochordal movement of the cranio-sacral rythm. This is the opening/closing movement that we see in a flower or a notochord!(that makes sense) This movement isn't always considered in a list of evolutionary movements.
2. The lateral movement of the fish. The fish moves laterally, or side to side. The evolutionary separation from the jelly fish is the introduction of a spine, which allows for a counter or antagonistic relationship of the muscles. The fish's muscles are found laterally. The fish has limited movement control because the muscle orientation only allows for one force vector.
3. The amphibian and reptile. Here we see the first limbs, fish with legs and a neck, which makes it easier to get the head to the food. The limbs are not under the body but to the outsides. Movement is still primarily laterally controlled.
4. Mammalian. Here the legs are under the body and the movement is more in the sagital plane rather than lateral. The lateral musculature has moved into the dorsum and ventral aspects of the of the body. Think about this. In the mammal we don't encounter much muscle in the lateral aspects of the body, this is where the ribs are.
When we look at a biped or a quadruped we can see these later 3 movements if we watch the pelvis. Some individuals will walk with a rear the wraps around the spine, I call this the Marilyn Monroe walk. This correlates with the fish.
Next is the hips that move up and down which is in the next phase of evolution, or the reptile/amphibian.
Lastly is the mammalian which moves in the sagital plane of dorsal/ventral, anterior/posterior.
This is all good but what causes the body to assume a pattern that is lower in the evolution scheme of things?
More later.