1. Heads develop in animals by an evolutionary trend known as cephalization . 2. Cephalization is intrinsically connected with a change in chordates from the notochord.3. Bilateralization led to the evolution of brains, a process called cephalization . 4. Consequently, scientists believe that cephalization characterized all bilaterally symmetrical animals from their origins. 5. In arthropods, cephalization progressed with increasing incorporation of trunk segments into the head region. 6. Even hydras, which are primitive, radially symmetrical cnidarians, show some degree of cephalization . 7. Cephalization in vertebrates, the group that includes mammals, birds, and fishes, has been studied extensively.8. The cephalization factor and the subsequent encephalization quotient was developed by H . J . Jerison in the late 1960s. 9. A "'nerve net "'consists of interconnected neurons lacking a brain or any form of cephalization . 10. In addition, wheel bugs feature cephalization in the form of a pair of long antennae which project from the head.
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