動物 (Tōng-bu̍t)的 (ê)腦 (naú)抑 (ia̍h)腦髓 (naú-chhé) (英語 (Eng-gí): brain) 是 (sī)指 (kí)中樞 (tiong-chhu)神經 (sîn-keng)系統 (hē-thóng) (central nervous system) 的控制 (khòng-chè)中心 (tiong-sim)。大分 (Toā-hūn)動物的腦踮 (tiàm)佇 (tī)頭呢 (thaû--nih),予 (hō͘)頭殼碗 (thaû-khak-oáⁿ) (skull) 保護 (pó-hō͘)條 (tiâu),佮 (kap)主要 (chú-iàu)的知覺 (ti-kak)器官 (khì-koan)真 (chin)相倚 (sio-oá),像 (chhiūⁿ)講 (kóng)是菊 (sī-kak) (vision),聽覺 (thèng-kak) (hearing),味覺 (bī-kak) (taste),佮嗅覺 (hiù-kak) (olfaction)。人類 (Jîn-lūi)的腦是負責 (hū-chek)思考 (su-khó) (thought) 的器官。全部 (Choân-pō͘)的脊椎 (chek-chui)動物攏 (lóng)有 (ū)腦,猶 (ah)若 (nā)無脊椎 (bô-chek-chui)動物 (invertebrate) 有的 (ū-ê)有集中 (chi̍p-tiong)的腦,有的是有真濟 (chē)神經節 (sîn-keng-chat) (ganglion)。腦會得 (ē-tit)真複雜 (ho̍k-cha̍p),比論 (pí-lūn)講人類的腦有超過 (chhiau-koè)1000億 (ek)的神經元 (sîn-keng-goân) (neuron),逐 (ta̍k)个 (ê)神經元閣 (koh)佮另外 (lēng-goā)幾若 (kúi-nā)千 (chheng)的接 (chiap)做伙 (chò-hoé)。