Back ترئيس Arabic Cefalització Catalan Cephalisation German Cefalización Spanish Tsefalisatsioon Estonian Céphalisation French Cefalizacija Croatian 頭化 Japanese Cefalisatie Dutch Cefalizacja Polish
Cephalization is an evolutionary trend in animals that, over many generations, the special sense organs and nerve ganglia become concentrated towards the rostral end of the body where the mouth is located, often producing an enlarged head. This is associated with the animal's movement direction and bilateral symmetry, and cephalization of the nervous system led to the formation of a brain with varying degrees of functional centralization in three phyla of bilaterian animals, namely the arthropods, cephalopod molluscs, and vertebrate chordates (craniates).