CONTENTS ix 



CHAPTER VIII 



THE DEVELOPMENT OF THE EXTERNAL FORM OF THE BODY 133 



Branchial Arches Face Neck 145 



The Extremities 149 



Age and Length of Embryos 151 



Normal, Abnormal and Pathological Embryos 154 



References for Further Study 155 



PART II.-ORGANOGENESIS 



CHAPTER IX 



THE DEVELOPMENT OF CONNECTIVE TISSUES AND THE SKELETAL SYSTEM . . 161 



Histogenesis 163 



Fibers and Fibrils 166 



Adipose Tissue 167 



Cartilage 168 



Osseous Tissue 169 



Intramembranous Ossification 169 



Intracartilaginous Ossification ' 172 



The Development of the Skeletal System 178 



The Axial Skeleton 178 



The Notochord 178 



The Vertebrae 179 



The Ribs 184 



The Sternum 185 



The Head Skeleton 186 



Ossification of the Chondrocranium 190 



Membrane Bones of the Skull 192 



Bones Derived from the Branchial Arches 194 



The Appendicular Skeleton 198 



Development of Joints 205 



Anomalies 209 



References for Further Study 213 



CHAPTER X 



THE DEVELOPMENT OF THE VASCULAR SYSTEM 216 



The Blood Vascular System 216 



Principles of Vasculogenesis 224 



The Heart 227 



The Septa 233 



The Valves 236 



Changes after Birth 237 



The Arteries 240 



The Veins 250 



