TABLE OF CONTENTS. ix 



I02. Auricular appendages, io3. Vascular System, 102—106. 

 Commenoemeut of oiroulatiou, 102. The primitiYe aortas 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, 

 108. 



CHAPTER VI. 



The Changes which take place duking the Third Day, 

 pp. 109—194. 

 The diminution of the alhumen, 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, 

 1 13. The change in position of the embryo, 113 — 116. 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 thalamenoephalon, 

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

 119. The stomodffium, 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 — 139. The spinal nerves, 129. The 

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

 The eye, I ^'j — 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 peotinatum, 

 144. The histological changes in the retina, 144 — 146. Optic neiTe, 

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

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

 The cornea, 150 — 153. The aqueous humour, 153. Summary of the 

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

 glands and duct, 155, 156. The organ of hearing, ie,6 — 161. Closure 



