WordNet

support on poles; "pole climbing plants like beans"
deoxidize molten metals by stirring them with a wooden pole
one of the two ends of a magnet where the magnetism seems to be concentrated (同)magnetic_pole
a long (usually round) rod of wood or metal or plastic
a long fiberglass sports implement used for pole vaulting
one of two points of intersection of the Earths axis and the celestial sphere (同)celestial pole
one of two antipodal points where the Earths axis of rotation intersects the Earths surface
one of two divergent or mutually exclusive opinions; "they are at opposite poles"; "they are poles apart"
a living organism characterized by voluntary movement (同)animate being, beast, brute, creature, fauna
marked by the appetites and passions of the body; "animal instincts"; "carnal knowledge"; "fleshly desire"; "a sensual delight in eating"; "music is the only sensual pleasure without vice" (同)carnal, fleshly, sensual
a native or inhabitant of Poland
(Jungian psychology) the inner self (not the external persona) that is in touch with the unconscious

PrepTutorEJDIC

(木製・金属性などの)『棒』,さお / 柱 / (牛車・馬車の)ながえ / ボール(長さの単位,5.03メートル;面積の単位,25.3平方メートル) / …‘を'棒で動かす(押す,突く,たたく)
(地球などの)『極』 / 電極;磁極;(核・細胞などの)極 / (性格・意見などの)相反対
(植物に対して)『動物』 / (人間以外の)『動物』,けだもの / (魚・鳥などに対して)哺乳動物(mammal) / けだもの(野獣)のような人 / (比較変化なし)《名詞の前にのみ用いて》動物の,動物性の,動物質の / (知的・精神的に対して)動物的な;肉欲的な
ポーランド人
《話》政治家

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/08/16 14:18:33」(JST)

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An oocyte with poles depicted

In developmental biology, an embryo is divided into two hemispheres: the animal pole and the vegetal pole within a blastula.

The animal pole consists of small cells that divide rapidly, in contrast with the vegetal pole below it. The animal pole draws its name from its liveliness relative to the slowly developing vegetal pole. In some cases, the animal pole is thought to differentiate into the later embryo itself, forming the three primary germ layers and participating in gastrulation. Sperm enters the egg at the animal pole.^[1]

The vegetal pole contains large yolky cells that divide very slowly, in contrast with the animal pole above it. The vegetal pole draws its name from its inactivity relative to the lively animal pole. In some cases, the vegetal pole is thought to differentiate into the extraembryonic membranes that protect and nourish the developing embryo, such as the placenta in mammals and the chorion in birds.

In the frog Xenopus laevis, a pigment pattern provides the oocyte with features of a radially symmetrical body with a distinct polarity. The animal hemisphere is dark brown, and the vegetal hemisphere is only weakly pigmented. The axis of symmetry passes through on one side the animal pole, and on the other side the vegetal pole. The two hemispheres are separated by an unpigmented equatorial belt. Polarity has a major influence on the mergence of the embryonic structures. In fact, the axis polarity serves as one coordinate of geometrical system in which early embryogenesis is organised.^[2]

References

^ Text-book of Embryology, Volume 1
^ P. Hausen, M. Riebesell: The Early Embryonic Development of Xenopus Laevis - An Atlas of the Histology ISBN 3-921ö15-ö4-9

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