The head problem: the organizational significance of segmentation in head development
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| Main Authors: | , , |
|---|---|
| Format: | Book |
| Language: | English |
| Published: |
Prague
Karolinum Press
2010
|
| Series: | Acta Universitatis Carolinae
Medica : Monographia ; 158 |
| Online Access: | Inhaltsverzeichnis |
| Physical Description: | 165 S. Ill. |
| ISBN: | 9788024617602 |
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| 245 | 1 | 0 | |a The head problem |b the organizational significance of segmentation in head development |c Tim J. Horder, Robert Presley and Jaroslave Slípka |
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Record in the Search Index
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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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| institution | BVB |
| isbn | 9788024617602 |
| language | English |
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| series | Acta Universitatis Carolinae |
| series2 | Acta Universitatis Carolinae : Medica : Monographia |
| spelling | Horder, Tim J. Verfasser aut The head problem the organizational significance of segmentation in head development Tim J. Horder, Robert Presley and Jaroslave Slípka Prague Karolinum Press 2010 165 S. Ill. txt rdacontent n rdamedia nc rdacarrier Acta Universitatis Carolinae : Medica : Monographia 158 Presley, Robert Verfasser aut Slípka, Jaroslav Verfasser aut Acta Universitatis Carolinae Medica : Monographia ; 158 (DE-604)BV035917046 158 HBZ Datenaustausch application/pdf 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 Inhaltsverzeichnis |
| 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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