154 



DEVELOPMENT OF ARTERIES IN FORELIMB OF PIG. 



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system. I. Die Armarterien dea Menschen. 



Anat. Hefte, 1." 



1904. II. Die Armarterien der Saugetiere. Anat. 



Hefte, 1." 



1908. III. Zur Kenntnis der Fliigelarterien der 



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vorderen Extremitaten bei den Vogeln. Arch. 



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the chick. Anat. Anz., vol. 26. 

 Sabin, F. R., 1904. On the development of the blood- 

 vessels of the brain in the human embryo. Amer. 



Jour. Anat., vol. 4. 



1917. Origin and development of the blood-vessels 



of the chick and of the pig. Contributions to 

 Embryology, vol. 6. Carnegie Inst. Wash. Pub. 

 No. 226. 



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 the human lower extremity. Amer. Jour. Anat., 

 vol. 25. 



Streeter. G. L., 1918. The developmental alterations 

 in the vascular system of the brain of the human 

 embryo. Contributions to Embryology, vol. 8. 

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DESCRIPTION OF PLATES. 



Plate 1. 



Fig. 1. Dorsal view of the right forelimb of a 4.5-mm. pig embryo, showing the polysegmental arterial supply to the 

 limb and capillary net. 



Fig. 2. Dorsal view of the left forelimb of a 7.5-mm. pig embryo. The polysegmental supply to the limb has under- 

 gone reduction. The bud shows retiform and capillary vessels. 



Fig. 3. Dorsal view of left forelimb of an 8.5-mm. pig embryo. The seventh segmental persists as the subclavian 

 artery and after entering the limb-bud becomes retiform and then ends in capillaries. The subclavian 

 vein also appears. 



Plate 2. 



Fig. 



4. Ventral view of left forelimb of a 12-mm. pig embryo. The proximal branches of the subclavian appear as 

 capillary nets. The subclavian is retiform. Its termination is the dorsal and ventral branches. The 

 veins have become well defined and continuous around the limb margin. 

 Fig. 5. Ventral view of the forelimb in a 19-mm. embryo. Vascular pattern is nearly complete. 



