The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 142 THE FOURTH DAT. [chap. Fig. 46. MP -\-M Embeto at the End of the Fourth Day seen as a tkansparent object. The amnion has been completely removed, the cut end of the somatic stalk is shewn at with the allantois (Al.) protruding from it. cerebral hemisphere. F. B. fore brain or vesicle of the third ventricle with the pineal gland (Pn.) projecting from its summit. mid brain. Cb. cerebellum. IV. V. fourth ventricle. L. lens. choroid slit. Owing to the growth of the opt
The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 142 THE FOURTH DAT. [chap. Fig. 46. MP -\-M Embeto at the End of the Fourth Day seen as a tkansparent object. The amnion has been completely removed, the cut end of the somatic stalk is shewn at with the allantois (Al.) protruding from it. cerebral hemisphere. F. B. fore brain or vesicle of the third ventricle with the pineal gland (Pn.) projecting from its summit. mid brain. Cb. cerebellum. IV. V. fourth ventricle. L. lens. choroid slit. Owing to the growth of the optic cup the two layers of which it is composed cannot any longer be seen from the surface, but the posterior surface of the choroid layer alone is visible. Cen. V. auditory vesicle. superior maxillary process. iF. lF. etc. first, second, third and fourth visceral folds. F. fifth nerve sending one branch to the eye. the ophthalmic branch, and another to the first visceral arch. VII. seventh nerve passing to the second visceral arch. G. Ph. glossopharyngeal nerve passing towards the third visceral arch. Pg. pneuraogastric nerve passing towards the fourth visceral arch. iv. investing mass. No attempt has been made in the figure to indicate the position of the dorsal wall of the throat, which cannot be easily made out in the living embryo. ch. notochord. The front end of this cannot be seen in the living embryo. It does not end however as shewn in the figure, but takes a sudden bend downwards and then terminates in a point. Ht. heart seen through the walls of the chest. M. P. muscle-plates. W. wing. H. L. hind limb. Beneath the hind limb is seen the curved tail.
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