Influence of Nerve Cord Removal on Pharynx Induction by Head Piece Transplanted in Postpharyngeal Body Region of the Planarian, Dugesia japonica japonica(Developmental Biology)

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概要

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• The effect of nerve cord removal on the inductive formation of new pharynges in freshwater planarian, Dugesia japonica japonica, was studied. The head piece was previously transplanted in the postpharyngeal region of the animals. Both left and right nerve cords of the host animals were extirpated in the region anterior to the given head piece at varying periods of time after transplantation. New pharynges were found to be induced in these animals and their number and developmental stages were examined for respective specimens. Plural induced pharynges were found only in specimens in which the nerve cords were extirpated on the second day after trans plantation of the head piece. Some of these pharynges showed the incomplete rudimentary structure and their polarity was distorted. These results show that the nerve cords have inhibitory action for the apparition of the pharynx and that they dominate the pharyngeal polarity, probably through deter mining the body polarity. In addition, it was suggested that the nerve cords might secrete a substance which would be utilized as nutrient and promote the growth of the developing pharynx.

• 社団法人日本動物学会の論文

著者

• Kishida Y

  Chugokugakuen Univ. Okayama Jpn

• Kishida Yoshikazu

  Department Of Biology Faculty Of Science Kanazawa University

• ASAI ETSUO

  Department of Biology, Kanazawa Medical University

• Asai E

  Kanazawa Medical Univ. Ishikawa Jpn

• Asai Etsuo

  Department Of Biology College Of Liberal Arts Kanazawa Medical University

関連論文

• The Role of the Nervous System in the Planarian Regeneration : I.Regeneration of Body Fragments Deprived of Ventral Nerve Cords
• Effect of Delay in Anterior or Posterior Amputation on Regeneration of Short Fragments of Planaria(Developmental Biology)
• The Role of the Nervous System in the Planarian Regeneration : III.The Influence of the Head and the Nerve Cords on the Blastema Regeneration
• Influence of Nerve Cord Removal on Pharynx Induction by Head Piece Transplanted in Postpharyngeal Body Region of the Planarian, Dugesia japonica japonica(Developmental Biology)
• Induction of Pharynx by Nerve-Cordless Prepharyngeal Tissue Graft in Planaria(Developmental Biology)
• Regeneration of the Distal Part of the Pharynx of the Freshwater Planarian,Dugesia japonica japonica Ichikawa et Kawakatsu
• Regeneration of the Pharynx in a Freshwater Planarian : An Electron-Microscopic Study with Special Reference to the Formation of the Pharyngeal Cavity and Pharyngeal Lumen(Morphology)

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