CONTENTS. 



GLOSSARY OF VARIATIONS BETWEEN INTERNATIONAL AND OLD TERMINOLOGY 

 INTRODUCTION . 



PAGE 



xvii 



GENERAL EMBRYOLOGY. 



The Animal Cells 



Reproduction of Cells ... 

 Amitotic and Mitotic Division of 



Cells .' 



The Ovum 



Its Structure 



Its Maturation 



The Spermatozoon 



Fertilisation 



Segmentation 



Formation of Blastula . . . . 



Ectoderm and Entoderm . . . 



Embryonic Area . . . . 



Extra-Embryonic Coelom ... 



Differentiation of the Embryonic 



Area 



Neural Groove ..... 

 Formation of Notochord and Secondary 



Mesoderm 



The Paraxial Mesoderm .... 



Mesodennic Somites .... 



Early Stages in Development of the 



Nervous System .... 



Nerve Ganglia and Chromaffin 



Tissues 



Differentiation of the Neural Tube . 

 Fate of Walls of Primitive Brain 



Vesicles 



Fate of Cavities of Primitive 



Brain 



Folding off of the Embryo ... 



Professor ARTHUR ROBINSON. 



PAGE : PAGE 



7 | Formation of the Embryo ... 39 



8 Development of the Limbs ... 39 

 Primitive Alimentary Canal . . . 41 



9 The Fore -Gut Pharynx and Stoma- 



13 todaeum 42 



13 Visceral Clefts and Arches . . 43 



15 Rudiments of Respiratory System . 44 

 17 External Ear, Tympanic Cavity, 



20 and Auditory Tube ... 44 



21 The Tongue 45 



21 Derivatives of the Mid-Gut ... 47 



21 The Hind-Gut, Anal Passage, and Post- 

 22 anal Gut 48 



22 Derivatives of the Stomatodaeum 



The Nose and Mouth ... 48 



23 The Internal Ear 50 



23 Protection and Nutrition of the Embryo 



during its Intra-uterine Existence 53 



24 Foetal Membranes and Appendages . 53 



28 Chorion 53 



28 Amnion ...... 54 



Body-Stalk 54 



30 Allantois 54 



Umbilical Cord .... 55 



32 Yolk-Sac or Umbilical Vesicle . . 55 



33 The Placenta 56 



Primitive Vascular System and Foetal 



33 Circulation 63 



Summary of the External Features of 



36 the Human Embryo and Foetus at 



37 different periods of Development . 74 



OSTEOLOGY. 



The Skeleton 81 



Composition. of Bone . 82 



Structure of Bone .... 83 



Ossification and Growth of Bones . 85 



The Vertebral Column .... 87 



A Typical Vertebra .... 



Cervical Vertebrae . . . . 90 



Thoracic Vertebrae .... 93 



Lumbar Vertebras .... 95 



False or Fixed Vertebrae . . .96 



The Sacrum 96 



The Coccyx 99 



The Vertebral Column as a whole . 100 



Professor ARTHUR THOMSON. 



Development of the Vertebral Column . 102 

 The Cartilaginous Column . . .102 

 Ossification of the Vertebrae ... 104 



The Sternum 106 



The Ribs 109 



The Costal Cartilages . . . .113 

 The Thorax as a whole . . . . 113 

 The Bones of the Skull . ... 115 



Frontal Bone 115 



Parietal Bones . . . . .118 

 Occipital Bone .... 120 



Temporal Bones .... 125 

 Sphenoid Bone 133 



