From Embryology

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Fig. 121 Diagrammatic Longitudinal Horizontal Section through the Fore-Brain

  • 3.v. - third ventricle
  • Iv. - lateral ventricle
  • It. - lamina terminalis
  • ce. - cerebral hemisphere
  • op. th. - optic thalamus.
The two lobes thus formed are the rudiments of the two hemispheres. The cavity of each of them opens by a widish aperture into a cavity at the base of the cerebral rudiment, which again opens directly into the cavity of the third ventricle (3 v). The Y-shaped aperture thus formed, which leads from the cerebral hemispheres into the third ventricle, is the foramen of Monro. The cavity (Iv) in each of the rudimentary hemispheres is a lateral ventricle. The part of the cerebrum which lies between the two hemispheres, and passes forwards from the roof of the third ventricle round the end of the brain to the optic chiasma below, is the rudiment of the lamina terminalis (Figs. 121 It and 123 trm). Up to this point the development of the cerebrum is similar in all Vertebrata, and in some forms it practically does not proceed much further.
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Foster, M., Balfour, F. M., Sedgwick, A., & Heape, W. (1883). The Elements of Embryology. (2nd ed.). London: Macmillan and Co.

Volume 1 - The History of the Chick: Egg structure and incubation beginning | Summary whole incubation | First day | Second day - first half | Second day - second half | Third day | Fourth day | Fifth day | Sixth day to incubation end | Figures 1
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