CONTENTS 



SECTION I 



GENERAL EMBRYOLOGY 



THE ANIMAL CELL 1 



Cytoplasm 1 



Centrosome 2 



Nucleus 3 



Cell -division 4 



HISTORY or THE SEX CELLS ... 5 



Structure of the Spermatozoon . . 5 



Spermatogenesis 6 



Structure of Oocyte .... 7 



Oogenesis : Formation of Polar Bodies 10 



Fertilisation . . . ... 14 



Reduction of Chromatin and Nuclear 



Changes during Maturation . . 17 



Significance of Nuclear Phenomena . 20 

 Chromosome Theory of Development : 



Mendel's Law of Heredity . . . 23 



SEGMENTATION OF THE OVUM . . 25 



FORMATION OF THE GERMINAL LAYERS 27 



of the Entoderm 27 



of the Embryonic Ectoderm and 



Amnion 29 



Entypy of the Germinal Area . . . 30 

 Formation of the Mesoderm and 



Embryonic Axis 32 



The Gastrula Theory . . . . 42 



PAGE 



EARLY CHANGES IN THE BLASTODERM . 48 



Neural Canal 48 



Notochord. 49 



Primitive Segments .... 49 



Cleavage of Mesoderm . . . . 51 



Separation of Embryo .... 52 



Allantois 55 



EARLY STAGES IN THE DEVELOPMENT 

 OF THE MUSCLES, CONNECTIVE 



TISSUES, AND BLOOD-VESSELS . 56 



The Mesenchyme 58 



Blood and "Blood-vessels of Yolk- 

 sac 59 



Early Stages in the Development of 

 the Heart and Embryonic Blood- 

 vessels 61 



DEVELOPMENT OF FCKTAL MEMBRANES 



AND PLACENTA .... 65 

 Imbedding of Ovum . . . . 65 

 Changes in the Uterus during Preg- 

 nancy 67 



Fo3tal Membranes 70 



Development of Placenta ... 72 



The Shed Placenta 77 



GENERAL HISTORY OF DEVELOPMENT 80, 92 



SECTION II 



DEVELOPMENT OF THE ORGANS 



PACE 



Classification 93 



DEVELOPMENT OF THE SKIN AND 



CUTANEOUS GLANDS . . . . 93 



DEVELOPMENT OF THE NERVOUS SYSTEM 94 



Histogenesis of Nerve-tissue . . 94 



Origin of Nerve -roots and Peripheral 



Nerves 98 



MORPHOGENESIS OF SPINAL CORD AND 

 BRAIN : 



Spinal Cord 101 



Brain 105 



Rhombencephalon (Rhombic Brain) 106 



Cerebellum 109 



Mesencephalon (Mid-brain) . . . Ill 



Prosencephalon (Fore-brain) . . Ill 



Cerebral Hemispheres . . . . 115 



MORPHOGENESIS OF BRAIN continued. 



Corpus Striatum 119 



Hippocampal Formation and Com- 

 missures 121 



Formation of the Fissures . . . 124 

 DEVELOPMENT OF THE PERIPHERAL 



NERVES 125 



Spinal Nerves 125 



Cerebral Nerves 127 



Development of Individual Cerebral 



Nerves 130 



The Sympathetic 133 



DEVELOPMENT OF THE EYE . . . 136 



Lens 137 



Retina 140 



Optic Stalk and Nerve . . . .141 



Vitreous Body and Lens Capsule . 141 



