Cephalization is considered an evolutionary trend, whereby nervous tissue, over many generations, becomes concentrated toward one end of an organism.
The differentiation of the anterior (front) end of an organism into a definite head.
Considered an evolutionary advance,
noun ceph·a·li·za·tion \ˌse-fə-lə-ˈzā-shən\. Definition of
ceph·a·li·za·tion n. An evolutionary trend in the animal kingdom toward centralization of neural and sensory organs in the head or anterior region of the body.
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Two major trends characterize the evolution of nervous systems in the bilaterally
symmetrical phyla of animals: centralization and
This is know as