cephalization

ceph·a·li·za·tion

C0206200 (sĕf′ə-lĭ-zā′shən)n. An evolutionary trend in the animal kingdom toward centralization of neural and sensory organs in the head or anterior region of the body.

cephalization

(ˌsɛfəlaɪˈzeɪʃən) or

cephalisation

n (Zoology) (in the evolution of animals) development of a head by the concentration of feeding and sensory organs and nervous tissue at the anterior end

ceph•a•li•za•tion

(ˌsɛf ə ləˈzeɪ ʃən)

n. a tendency in animal evolution to localization of important organs or parts in or near the head.

Cephalization

cephalization

[‚sef·ə·lə′zā·shən] (zoology) Anterior specialization resulting in the concentration of sensory and neural organs in the head.

Cephalization

the intensified development of the cephalic portion of the body in bilaterally symmetric animals during the process of evolution. The head end of the body, which includes the oral orifice, is first to experience new objects in the environment. As a result, the sense organs (vision, olfaction, touch, and hearing, the latter being developed only in vertebrates) and the sections of the nervous system that regulate the sense organs and make up the brain are concentrated in the head end of the body. In vertebrates a skull has developed to protect the aforementioned organs. In invertebrates this protective function is performed by a hard external cover. In cephalopods the brain is protected by a cartilage capsule.

cephalization

ceph·a·li·za·tion

(sef'ăl-ĭ-zā'shŭn), 1. Evolutionary tendency for important functions of the nervous system to move forward in the brain. 2. Initiation and concentration of the growth tendency at the anterior end of the embryo. 3. The antigravitational redistribution of pulmonary blood flow that occurs with heart failure, caused by increased vascular resistance in the dependent part of the lung, a consequence of pulmonary venous hypertension; usually described on the basis of relative vascular size on chest radiography.

cephalization

(sĕf′ə-lĭ-zā′shən)n. An evolutionary trend in the animal kingdom toward centralization of neural and sensory organs in the head or anterior region of the body.

cephalization

the development of the head of an organism during evolution. The development is largely associated with a concentration of sense organs at the front of an animal (see BRAIN). The complexity of the head region depends on the habits of the animal; highly active, free-living animals have the best-developed cephalization requiring maximum detection of the environment at the front, whereas sedentary forms normally have less well-developed heads.

单词	cephalization
释义	cephalization ceph·a·li·za·tion C0206200 (sĕf′ə-lĭ-zā′shən)n. An evolutionary trend in the animal kingdom toward centralization of neural and sensory organs in the head or anterior region of the body. cephalization (ˌsɛfəlaɪˈzeɪʃən) or cephalisation n (Zoology) (in the evolution of animals) development of a head by the concentration of feeding and sensory organs and nervous tissue at the anterior end ceph•a•li•za•tion (ˌsɛf ə ləˈzeɪ ʃən) n. a tendency in animal evolution to localization of important organs or parts in or near the head. Cephalization cephalization [‚sef·ə·lə′zā·shən] (zoology) Anterior specialization resulting in the concentration of sensory and neural organs in the head. Cephalization the intensified development of the cephalic portion of the body in bilaterally symmetric animals during the process of evolution. The head end of the body, which includes the oral orifice, is first to experience new objects in the environment. As a result, the sense organs (vision, olfaction, touch, and hearing, the latter being developed only in vertebrates) and the sections of the nervous system that regulate the sense organs and make up the brain are concentrated in the head end of the body. In vertebrates a skull has developed to protect the aforementioned organs. In invertebrates this protective function is performed by a hard external cover. In cephalopods the brain is protected by a cartilage capsule. cephalization ceph·a·li·za·tion (sef'ăl-ĭ-zā'shŭn), 1. Evolutionary tendency for important functions of the nervous system to move forward in the brain. 2. Initiation and concentration of the growth tendency at the anterior end of the embryo. 3. The antigravitational redistribution of pulmonary blood flow that occurs with heart failure, caused by increased vascular resistance in the dependent part of the lung, a consequence of pulmonary venous hypertension; usually described on the basis of relative vascular size on chest radiography. cephalization (sĕf′ə-lĭ-zā′shən)n. An evolutionary trend in the animal kingdom toward centralization of neural and sensory organs in the head or anterior region of the body. cephalization the development of the head of an organism during evolution. The development is largely associated with a concentration of sense organs at the front of an animal (see BRAIN). The complexity of the head region depends on the habits of the animal; highly active, free-living animals have the best-developed cephalization requiring maximum detection of the environment at the front, whereas sedentary forms normally have less well-developed heads.
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