TABLE OF CONTENTS. IX 



102. Auricular appendages, 102. Vascular System, 102 106. 

 Commencement of circulation, 102. The primitive aortae and first 

 pair of aortic arches, 102, 103. The vitelline vessels and sinus ter- 

 minalis, 103, 104. The course of the circulation, 105. The second 

 and third pairs of aortic arches, 105, 106. The Wolffian duct and 

 first appearance of Wolffian body, 106. The growth of the amnion, 



107. The first appearance of the allantois, 107. Summary, 107, 



1 08. 



CHAPTER VI. 



THE CHANGES WHICH TAKE PLACE DURING THE THIRD DAY, 



pp. 109194. 



The diminution of the albumen, 109. The spreading of the opaque 

 and vascular areas, 109, no. The vascular area, no 113. The 

 continued folding-in of the embryo, 113. The increase of the amnion, 

 113. The change in position of the embryo, 1 1 3 1 16. The curvature 

 of the body, 116. The cranial flexure, 116, 117. The brain, 117 123. 

 Growth of the vesicle of the cerebral hemispheres, 117. The lateral 

 ventricles, 117. The vesicle of the 3rd ventricle or thalamencephalon, 

 117. The rudiment of the pineal gland, 117, 118. The infundibulum, 

 119. The stomodaeum, 119. The pituitary body, 119 121. Changes 

 in the mid-brain, the corpora bigemina, crura cerebri and iter, 121. 

 Changes in the hind-brain, the medulla, cerebellum; 4th ventricle, 

 121, 122. Changes in the neural canal, 122, 123. The cranial 

 and spinal nerves, 123 132. The neural band, 123 126. The fifth, 

 seventh, ninth and tenth cranial nerves, 126, 127. Later develop- 

 ment of cranial nerves, 127 129. The spinal nerves, 129. The 

 shifting of point of attachment of nerves, 131. Anterior roots, 131. 

 The eye, 137 156. The first changes in the optic vesicles, 132, 133. 

 The secondary optic vesicle and development of the lens, 134 137. 

 The choroidal fissure, 137 140. The choroid, sclerotic and cornea, 

 140, 141. The further development of the optic vesicle, 141. The 

 ora serrata, 142. The iris, 142. Pigment epithelium of choroid, 142. 

 The ciliary processes, uvea, ciliary muscle and ligamentum pectinatum, 

 144. The histological changes in the retina, 144 146. Optic nerve, 

 146, 147. The choroid fissure, 147. The pecten, 148. The histo- 

 logical changes in ths lens, 149, 150. The vitreous humour, 150. 

 The cornea, 1 50 153. The aqueous humour, 153. Summary of the 

 development of the eye, 154, 155. The eyelids, 155. The lacrymal 

 glands and duct, 155, 156. The organ of hearing, 156 161. Closure 



