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Development of Limbs in Urodeles and the Origin of Tetrapod Limbs

机译:乌头肌肢体的发育和四足动物肢体的起源

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摘要

On the basis of studies on serial sections of larval Ranodon sibiricus limbs and published data, the hypothesis of the origin of tetrapod limbs from the biserial archipterygium is proposed. The mesomeres of the central axis of the biserial fin correspond (in proximodistal direction) to the humerus, ulna, ulnare, all carpalia distalia, metacarpale 1, and phalanges of the first digit in the forelimb of caudate amphibians and to the femur, fibula, fibulare, tarsalia distalia, metatarsale 1, and phalanges of the first digit in the hind limb. The preaxial elements of the zygopodium and autopodium, which are positioned proximal to the digital arch, correspond to the preaxial rays of the biserial fin, and digits 2-5 correspond to its postaxial rays. As the fin transformed into the limb, the central axis curved preaxially, forming the digital arch and resulting in partial reduction and fusion of preaxial rays.
机译:在对幼体Ranodon sibiricus肢体的连续切片进行研究和公开数据的基础上,提出了双足弓足类四足动物肢体起源的假说。双鳍的中轴中心线(在近前方向上)对应于肱骨,尺骨,尺骨,所有腕骨远端,掌骨1和尾两栖动物前肢的第一位指骨以及股骨,腓骨,腓骨,tarsalia远端畸形,meta骨1和后肢中第一个手指的指骨。合子足和自足足的前轴元素位于数字弓的近端,对应于双鳍的前轴射线,数字2-5对应于其后轴射线。当鳍片转变成肢体时,中心轴向轴向弯曲,从而形成数字弓,并导致轴向射线的部分减少和融合。

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  • 来源
    《Biology Bulletin》 |2009年第2期|148-158|共11页
  • 作者

    D. N. Mednikov;

  • 作者单位

    Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 119071 Russia;

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