Schlusswort

Leyhausen, P.

doi:10.1007/978-3-0348-5353-8_12

Cited by 1 publication

(2 citation statements)

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“…The results of series S1 to S5 (19), based on 801 experiments, confirm those of series A1 to A5 described above, but add important aspects to the role of the ectoderm. The influence of the factor E-mass is introduced, which is dealt with in the statistical investigations in the present paper.…”

Section: Classical Analysissupporting

confidence: 84%

“…3) confirm that CM is indeed able to continue epigenetic development as well as self-differentiation autonomously. These series, however, reveal additionally that these processes ought to be regarded as being closely linked to ectodermal contact, afterall (19). Statistical significance of the factors, E-age and E-mass, underlines this assumption.…”

Section: Discussionmentioning

confidence: 93%

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Early Reciprocal Interactions between Ectoderm and Chordamesoderm: Statistical Evaluation of Classical Embryological Experiments

Leyhausen

1987

Dev Growth Differ

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Embryos of the urodele Ambystoma mexicanum were used in time set experiments for the analysis of ectoderm-chordamesoderm interactions in "primary embryonic induction". The influence of chordamesoderm-age (CM-age), ectoderm-age (E-age), ectoderm-mass (E-mass) on differentiation processes were investigated. The results revealed that early interactions exist, which, however, seem to be dominated by the ectoderm in various respect: a) the segregation of the CNS is due to the autonomous change in ectoderm competence phases; b) based on the temporal sequence of competence phases, influences are exerted by the ecto-neuroderm which support the chordamesoderm in its self-differentiation capability to chorda and other mesodermal tissues. Consequently, reciprocal impulses from these newly differentiated tissues are warranted (feedback to ectoderm); c) coordination of the cranialization effect and corresponding ectodermal competence phase is achieved; d) the inductive efficiency of the chordamesoderm is strongly supported.Three statistical tests (regression, correlation, information analyses) were conducted (dependant variables: quality and quantity of the differentiated structures; independant variables: experimental factors). All three tests equally rendered statistical significance for the following order of decreasing importance the experimental factors play in induction and differentiation processes: E-age, E-mass, CM-age.

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Section: Classical Analysissupporting

confidence: 84%

Section: Discussionmentioning

confidence: 93%