My other websites: My Dysfunctional Family Subcortical Brain140622 - 1333 modified
Children of the Amphioxus Boys without Fathers
Brain of the Tiger Salamander Herrick Update
Since the most easily observable behavior is locomotion, I'll look at that first.
My central focus has always been human behavior. Since my BA in math was focused on the construction of complex deductive structures from simple building blocks such as axioms, I've taken a similar approach to human behavior.
I've located quite a lot of information, but it's scattered through several different pages. Fitting all that scattered information into a coherent whole has proven quite difficult, so, for the moment, I'm going to just put the links in their approximate evolutionary order.
Central Pattern Generators Bilateria
Pre-Bilateria Locomotion Bilateria Locomotion
Chordates Pre-Chordate Locomotion Chordate Locomotion
Amphioxus Motor Nerves Motor Nerve Organization
Ventral Motor Neurons Dorsal Motor Neurons
Primary Motor Center Amphioxus Fast-Slow Twitch
Amphioxus Locomotion Amphioxus Behavior
Lamprey Lamprey Locomotion
Spinal Locomotor Generator
Motor Programs Adult Behavior
Teleost Prey Catching
Mesencephalic Locomotor Region
Nucleus Accumbens Septi
The earliest forms of behavior are listed in Pre-Bilateria Locomotion .
Bilateria Locomotion : According to 'Back in time' in Bilateria , the first Bilateria was the common ancestor of cnidarians , a phyla of the Coelenterata , and Flat Worms . The Flat Worms are already capable of quite complex behavior.
Central Pattern Generators : Swimming seems to begin with the Bilateria before the evolution of the Deuterostomes from the Protostomes . Pre-Chordate Locomotion
As discussed in Chordate Locomotion , the amphioxus and all other Chordates swim during at least part of their life cycle.
See: Amphioxus Locomotion .
Chordate swimming is generated by the Spinal Locomotor Generator .
Movement of the four limbs is generated by the Mesencephalic Locomotor Region
The Superior Colliculus allows sensory input to shape behavior.
Nucleus Accumbens Septi looks at the mechanisms for choosing between different potential behaviors. As pointed out in Lamprey Nucleus Accumbens at least some of this mechanism predates the evolution of the cortex. Lamprey Locomotion
Brain of the Tiger Salamander provides an extremely detailed description of Salamander neuroanatomy.