Archive image from page 124 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 HEAD-FOLD TO TWELVE SOMITES 105 parts, sutura neurochordalis sen ventralis and sutura terminalis anterior.) The neuropore question resolves itself into this: What part of the sutura cerebralis anterior is to be called neuropore? As the suture extends from near the infundibulum to the pineal region at least, there is a wide range of choice. However, there is a point in the suture near its dorsal end where the separation of the ectcderm fr
Archive image from page 124 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 HEAD-FOLD TO TWELVE SOMITES 105 parts, sutura neurochordalis sen ventralis and sutura terminalis anterior.) The neuropore question resolves itself into this: What part of the sutura cerebralis anterior is to be called neuropore? As the suture extends from near the infundibulum to the pineal region at least, there is a wide range of choice. However, there is a point in the suture near its dorsal end where the separation of the ectcderm from the neural tube takes place later than elsewhere. This may be regarded as the equivalent of the neuropore. The suture is the site of formation of the lamina terminalis (Chap. VIII). Fig. 60. — The head of the same embryo from below X 30. a. i. p., Anterior intestinal portal. End'c. s., Endocardial septum. F. G., Fore-g;ut. Ht., Heart. N'ch. T., Termination of Notochord. op. Ves., Optic vesicle, p. C, Parietal cavity. Pr'a., Pro- amnion. V. o. m., Omphalo-mesenteric vein. It will be seen that according to this account most of the primary fore-brain includes no part of the original floor of the neural tube. Primary Divisions of the Neural Tube. The neural tube is the primordium of the brain and spinal cord. Its cavity becomes the ventricles of the brain and the central canal of the cord. There
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