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The head problem: the organizational significance of segmentation in head development

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Bibliographische Detailangaben
Beteiligte Personen:	Horder, Tim J. (VerfasserIn), Presley, Robert (VerfasserIn), Slípka, Jaroslav (VerfasserIn)
Format:	Buch
Sprache:	Englisch
Veröffentlicht:	Prague Karolinum Press 2010
Schriftenreihe:	Acta Universitatis Carolinae Medica : Monographia ; 158
Links:	http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=024421496&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA
Umfang:	165 S. Ill.
ISBN:	9788024617602

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Datensatz im Suchindex

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adam_text	Titel: The head problem Autor: Horder, Tim J Jahr: 2010 TABLE OF CONTENTS ABSTRACT................................................................................................................................................5 INTRODUCTION......................................................................................................................................7 The Goodrich synthesis........................................................................................................................9 PARTI METHODOLOGICAL ISSUES AND PROBLEMS; ON WHAT CRITERIA HAVE HEAD SEGMENTS BEEN IDENTIFIED?............................................13 1. HEAD CAVITIES................................................................................................................................13 a) Are head cavities a consistent feature throughout the vertebrates?................................................13 b) The nature of head cavities; how do head cavities relate to mesodermal organization as a whole?............................................14 c) Is there a fourth terminal preotic segment?..................................................................................16 Conclusions and remaining problems..................................................................................................16 2. SOMITOMERES..................................................................................................................................17 BOX 1 : A review of aspects of somitogenesis consistent with the somitomere concept....................17 a) Long-standing problems in comparing numbers of head segments across species........................21 b) The Meier-Jacobson scheme and its problems................................................................................22 c) Are preotic segment numbers stable across species?......................................................................24 Conclusions and remaining problems..................................................................................................25 3. MOLECULAR AND GENETIC CRITERIA......................................................................................26 a) Domains of Hox gene molecular expression support the Goodrich model......................................26 b) Is the head mesoderm involved?......................................................................................................27 c) The complex problem of causality..................................................................................................29 d) Models of spatial assignment..........................................................................................................31 Conclusions and remaining problems..................................................................................................32 COMMENTS ON METHODS............................................................................................................33 a) Molecular compared to morphological criteria................................................................................33 BOX 2: The role of segmentation......................................................................................................34 BOX 3: Somites control segmental organization in surrounding tissues..........................................36 b) The sufficiency of morphological criteria........................................................................................36 INTRODUCTION TO PART 2..................................................................................................................38 1. The segmental homology problem........................................................................................................38 2. Dual organism theories......................................................................................................................38 PART 2 A NEW, COMPREHENSIVE ANALYSIS OFTHE COMPARATIVE DATA..........................................40 Objectives of this presentation..............................................................................................................40 Mode of presentation............................................................................................................................40 BOX 4: Fate maps..............................................................................................................................40 COMMENTARIES ON TAXA..................................................................................................................41 a) Model types......................................................................................................................................41 Urodeles and other amphibians............................................................................................................41 Conclusions..........................................................................................................................................44 Lampreys..............................................................................................................................................45 Conclusions..........................................................................................................................................46 b) Examples of some variants..............................................................................................................47 Large yolked amphibians......................................................................................................................47 Myxinoids............................................................................................................................................48 Conclusions..........................................................................................................................................48 c) Explanations for groups where sufficient data on preotic mesoderm are lacking ..........................49 Teleosts................................................................................................................................................49 Conclusions..........................................................................................................................................49 Selachians............................................................................................................................................50 Amniotes..............................................................................................................................................51 Conclusions..........................................................................................................................................51 d) Possible ancestral forms..................................................................................................................51 SUMMING UP THE CASE FOR MESODERMAL SEGMENTS IN THE HEAD..................................52 GENERAL CONCLUSIONS....................................................................................................................54 INTRODUCTION TO PARTS 3 AND 4..................................................................73 PART 3 TOWARDS DEFINING THE DISTINCTIVE FEATURES OF THE HEAD..........................................74 a) The effects of head protrusion and cephalic flexure........................................................................76 b) The dynamics of the ventral midline of the head............................................................................76 c) Overall features and consequences of head extension....................................................................77 Summation and implications................................................................................................................78 PART 4 METHODOLOGICAL AND EVOLUTIONARY IMPLICATIONS........................................................81 1. METHODOLOGICAL CONSIDERATIONS......................................................................................81 a) The inevitability of the causal involvement of mechanics..............................................................81 b) The limitations of molecular-level analyses....................................................................................83 2. INFERRING EVOLUTIONARY ORIGINS; CONCEPTUAL CONSIDERATIONS AND PROBLEMS..................................................................84 a) Segmentation in the rostral head is probably fundamental..............................................................84 Conclusions......................................................................................................................................85 b) The likely dominance of somitic segmentation in the ancestral head..............................................86 Conclusions......................................................................................................................................87 c) Is PM the most rostral and therefore the most ancient segment?....................................................88 Conclusions......................................................................................................................................89 d) A possible scenario for the evolution of the vertebrate head..........................................................89 Conclusions......................................................................................................................................90 e) Is an evolutionary scenario for the ancestral origins of the chordate Bauplan possible?................90 Conclusions......................................................................................................................................92 SUMMATION............................................................................................................................................93 NOTES........................................................................................................................................................94 REFERENCES..........................................................................................................................................128
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spellingShingle	Horder, Tim J. Presley, Robert Slípka, Jaroslav The head problem the organizational significance of segmentation in head development Acta Universitatis Carolinae
title	The head problem the organizational significance of segmentation in head development
title_auth	The head problem the organizational significance of segmentation in head development
title_exact_search	The head problem the organizational significance of segmentation in head development
title_full	The head problem the organizational significance of segmentation in head development Tim J. Horder, Robert Presley and Jaroslave Slípka
title_fullStr	The head problem the organizational significance of segmentation in head development Tim J. Horder, Robert Presley and Jaroslave Slípka
title_full_unstemmed	The head problem the organizational significance of segmentation in head development Tim J. Horder, Robert Presley and Jaroslave Slípka
title_short	The head problem
title_sort	the head problem the organizational significance of segmentation in head development
title_sub	the organizational significance of segmentation in head development
url	http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=024421496&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA
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