单词	cephalization
释义	cephalization /ˌsɛfəlʌɪˈzeɪʃ(ə)n / /ˌkɛfəlʌɪˈzeɪʃ(ə)n/ noun [mass noun] Zoology The concentration of sense organs, nervous control, etc., at the anterior end of the body, forming a head and brain, both during evolution and in the course of an embryo’s development.Apparently, cephalization in the complex body plans of mandibulates (insects and crustaceans) has resulted in complex regulation of both the anterior and posterior expression boundaries in the head.... Scyphozoan polyps and medusae exhibit no cephalization and contain no brain, but in some species, light-sensitive eyespots are located along the bell margin of the medusa. In some flatworms, the process of cephalization has included the development in the head region of light-sensitive organs called ocelli.
随便看	thirtieth thirty thirty-eight thirtyfold Thirty-nine Articles thirty-second note thirty-twomo thirty-year rule Thirty Years War Thiruvananthapuram this this and that (or this, that, and the other) Thisbe this is it this is the life this minute (or this very minute) this much this side of this side of the black stump thistle thistledown Thistle, Order of the thistly this-worldly thither

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