Etude expérimentale sur les premiers stades du développement du membre antérieur chez l’embryon du Chélonien Emys orbicularis L.: détermination en mosaïque et régulation
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Media type:
E-Article
Title:
Etude expérimentale sur les premiers stades du développement du membre antérieur chez l’embryon du Chélonien Emys orbicularis L.: détermination en mosaïque et régulation
Contributor:
Vasse, J.
Published:
The Company of Biologists, 1977
Published in:
Development, 42 (1977) 1, Seite 135-148
Description:
ABSTRACTExperimental study on the early stages of development of the front limbs of the embryo of the chelonian Emys orbicularis L. : mosaic determination and regulationAblation of postotic somites 6– 13 on one side in embryos of Emys orbicularis L. or injury to the adjacent somatopleure at the developmental stage when 15– 21 somite pairs were present, led to arrest of forelimb-bud development in this part of the somatopleure on the operated side. Limb development in the remaining part of prospective somatopleure on the operated side was investigated 5– 11 days after the operation.When this part of somatopleure was adjacent to cranial somites 6– 9 or 6-10, the development stopped at the start of the apical crest as in Anguis or Scelotes forelimb-buds. A part of somatopleure adjacent to caudal somites 8– 12, 9– 12 or 10– 12 developed into a normal limb with three segments; a part of somatopleure adjacent to 1– 2 somites only, developed into a reduced limb, scarcely swelling.Each somitic level developed in relation to its initial regional determination dependent on position in the cephalocaudal axis; to its environment (cranial or caudal bud) and to the quantity of somatopleural material in the bud.