About Book

Animals belonging from phylum Porifera to phylum Echinodermata are categorized as non-chordates. Non-chordates are animals without a notochord. They are the most abundant and diversified of all animals living or extinct. According to their mode of living non chordate may be solitary like tapeworm, gregarious live in group for example locust, colonial live in social core example is honey bees, wasps and termite. The uncommon appearance of body system like digestive, reproductive, circulatory, the absence of notochord, pharynx not perforated by gill-slits make them differ from the chordates. Even the nerve chord which is present is double bearing ganglia and ventrally presents, their heart is also dorsal in position. Non-chordates include the phyla like porifera, coelenterata (cnidaria), ctenophora, platyhelminthes, aschelminthes, annelida, arthropoda, mollusca, echinodermata. The topics covered in this extensive book deal with the core subjects of Non-Chordates. The aim of this book is to present researches that have transformed this discipline and aided its advancement. It explores vertebrate retina, sex steroids, live cells and non-human vertebrates. It also deals with morphometry and vertebrates wildlife conservation. The topics included in it are of utmost significance and are bound to provide incredible insights to readers. In the book, constant effort has been made to make the understanding of the difficult concepts of the subject as easy and informative as possible, for the readers. Those in search of information to further their knowledge will be greatly assisted by this book.

Preface............................................................................................................v

Chapter 1 Nonunion of Osteoporotic Vertebral Fractures: Clinical Characteristics and Surgical Treatment.................................................1

1. Introduction ..........................................................................................1

2. Etiology ..................................................................................................2

3. Clinical situation ..................................................................................3

4. Imaging features ..................................................................................3

5. Treatment ..............................................................................................5

6. Conclusion .............................................................................................7

Chapter 2 Genome Banking for Vertebrates Wildlife Conservation .............12

1. Introduction..........................................................................................12

2. The male ..............................................................................................15

3. The female............................................................................................28

4. Options equally good for both males and females ....................62

5. Conclusion ...........................................................................................66

Chapter 3 Morphometry Applied to the Study of Morphological Plasticity During Vertebrate Development.........................................................117

1. Introduction ......................................................................................117

2. Adaptive and maladaptive morphological plasticity ...............120

3. Morphological responses by embryos and growing vertebrates

to environmental variables ............................................................123

4. Morphometric changes in response to physical/mechanical

injury....................................................................................................130

5. Morphometry may be the principle way to solve certain

developmental problems: 3-D analysis of primordial follicle

distribution ........................................................................................133

6. Summary ...........................................................................................138

7. Acknowledgments ...........................................................................138

Chapter 4 Minimally Invasive Treatment of Vertebral Body Fractures.......144

1. Introduction........................................................................................144

2. Spine anatomy ..................................................................................145

3. Features of vertebral fractures ......................................................146

4. Evaluation and selection of the patient ......................................148

5. Techniques of pain relief in vertebral compression fractures..150

6. Controversies ....................................................................................159

7. Conclusions .......................................................................................160

Chapter 5 Use of Dual-Energy X-Ray Absorptiometry (DXA) with Non-Human

Vertebrates: Application, Challenges, and Practical Considerations

for Research and Clinical Practice......................................................166

1. Introduction ......................................................................................166

2. DXA theory........................................................................................166

3. Basic applications of DXA...............................................................169

4. DXA use with animals.....................................................................169

5. Applications to veterinary medicine.............................................171

6. DXA precision in non-human vertebrates...................................174

7. Limitations/impediments for use of DXA in clinical practice....176

8. Conclusions........................................................................................182

9. Acknowledgment..............................................................................182

Chapter 6 Live Cells as Optical Fibers in the Vertebrate Retina..................190

1. Introduction........................................................................................190

2. The inverted vertebrate retina: optical properties of the

tissue....................................................................................................191

3. Methods to study cell and tissue optics of the vertebrate

retina....................................................................................................196

4. Experimental evidence for the presence of cellular optical

fibers in the retina............................................................................204

5. Open questions..................................................................................215

6. Conclusion..........................................................................................216

Chapter 7 Evolutionary Perspectives on Sex Steroids in the Vertebrates....221

1. Introduction........................................................................................221

2. Hormonal axes, gonadotropins and gonadotropin releasing

hormones............................................................................................222

3. Before the vertebrates: Sex steroids in the bilaterian animal

lineages (Bilateria: http://tolweb.org/Animals/2374)...................227

4. Reproductive variability among the vertebrate classes

(http://tolweb.org/Gnathostomata/14843)......................................230

5. Applied considerations....................................................................236

6. The “endocrine disruptor” hypothesis.........................................237

7. Conclusion..........................................................................................243

8. Abbreviations.....................................................................................243

Chapter 8 Degeneration and Regeneration in the Vertebrate Retina...........266

1. Introduction........................................................................................266

2. Retinal diseases..................................................................................267

3. Animal models for retinopathies...................................................270

4. Studying retina regeneration in vivo.............................................278

5. Conclusion..........................................................................................288

6. Acknowledgments.............................................................................289

Citation......................................................................................................303

Index...........................................................................................................305

About Author

Joshua Gonzalez is a Guest Lecturer at Community College, Canberra. He holds Ph.D. in Zoology from University of Science & Research, Leeds. His keen interest research topics are central nervous system of vertebrates, phylogenetic relationships between animals, and reproductive systems. Gonzalez has written numerous research papers and articles, to peer-reviewed journals on chordate genomics, deuterostome animals, methodology of ecophysiology, and physiological ecology of vertebrates, comparative physiology and evolutionary physiology. He has also won several awards for his knowledge and contributions to this field.