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céphalisation - translation to English
EVOLUTIONARY TREND FORMING A DISTINCT HEAD REGION IN MANY ANIMAL LINEAGES
Cephalisation
![movement]] the animal has head and tail ends, favouring cephalization by [[natural selection]]. Sense organs and mouth form the basis of the head.](https://commons.wikimedia.org/wiki/Special:FilePath/Bilaterian body plan.svg?width=200 "movement]] the animal has head and tail ends, favouring cephalization by [[natural selection]]. Sense organs and mouth form the basis of the head.")
![advanced 'camera' eyes]].](https://commons.wikimedia.org/wiki/Special:FilePath/Cuttlefish eye.jpg?width=200 "advanced 'camera' eyes]].")
.jpg?width=200 "70 px")
.jpg?width=200 "50 px")
![[[Brain]]s of [[shark]] and [[human]] illustrate accelerating cephalization, as the parts enlarge and change shape.](https://commons.wikimedia.org/wiki/Special:FilePath/Vertebrate-brain-regions small.png?width=200 "[[Brain]]s of [[shark]] and [[human]] illustrate accelerating cephalization, as the parts enlarge and change shape.")
.png?width=200 "100 px")
![The yellow papillae flatworm, ''[[Thysanozoon nigropapillosum]]'', is somewhat cephalized, with a distinct head end (at right) which has pseudotentacles and an eyespot.](https://commons.wikimedia.org/wiki/Special:FilePath/Yellow papillae flatworm (Thysanozoon nigropapillosum) (cropped).jpg?width=200 "The yellow papillae flatworm, ''[[Thysanozoon nigropapillosum]]'', is somewhat cephalized, with a distinct head end (at right) which has pseudotentacles and an eyespot.")
céphalisation
n. cephalization, tendency of vital organs to be located in or near the head (Zoology)
Definition
Cephalization
·noun Domination of the head in animal life as expressed in the physical structure; localization of important organs or parts in or near the head, in animal development.
Wikipedia
Cephalization
Cephalization is an evolutionary trend in which, over many generations, the mouth, sense organs, and nerve ganglia become concentrated at the front end of an animal, producing a head region. This is associated with movement and bilateral symmetry, such that the animal has a definite head end. This led to the formation of a highly sophisticated brain in three groups of animals, namely the arthropods, cephalopod molluscs, and vertebrates.
