Vascular System of tlic Thyroid Gland. 401 



lymphatics beneath the capsule. From there they empty into lymph- 

 atics draininc; the gland, which usually follow the blood vessels out, 

 one trunk passing upwards towards the submaxillary gland and the 

 other passing to the lower cervical region, as described by Baber and 

 figured by Bartels. In one injection the lower trunk of the left 

 gland was seen to pass directly into the left subclavian vein. These 

 observations were made upon the dog alone. 



In connection with the enormous blood supply of the thyroid 

 gland, an anatomical study shows conditions favorable to a rapid 

 and consequently a rich blood supply. The numerous arteries, the 

 fact that each artery does not terminate until it reaches the follicle, 

 the ultimate unit of the gland, would, theoretically considered, 

 aid rather than retard a rapid <'irculatioH through the gland. It is 

 rather interesting to note that the thyroid with its follicular artery 

 and vein, resembles to a certain extent the kidney with its glomerulus 

 and vasa afferentes and efferentes, and that the kidney, according to 

 Tschuewsky, shows a blood supply exceeded among the organs he 

 examined, only by the thyroid gland. 



BIBLIOGRAPHY. 



1. Tschuewsky, "Der Blutstrom in der Scbikldriise." Pfliiger's Archiv, Bd. 



97, July 6, 1903. 



2. Cyon, quoted by Howell "Text-book of Physiology," p. 775, 1900. 



3. Halsted and Evans. "The Paratbyi-oid Glandules, etc." Annals of Sur- 

 gery, Vol. XLVI, No. 4, Oct., 1907. 



4. Babeb. "Contributions to the Minute Anatomy of the Thyroid Gland of 

 the Dog." Philos. Trans. Roy. Soc, Loud., 1S7G. 



5. Baber. "Researches on the Minute Structure of tlie Thyroid Gland." 



Philos. Trans. Roy. Soc., Lond., 1881. 



6. Langendorff, "Beitrage zur Kenntnis der Schilddriise." Archiv fiir Auat. 



und Physiologie, Phys. Abt., 1889, Suppl. 



7. WoLFLEs. "Bau und Entwicklung der Schilddriise." Berlin, 1880. 



8. LusTiG. "Contribution a la connaissance de I'histogeuese de la glande tliy- 



roide." Archiv. italiennes de biologic, 1891. 



9. BiONDi. Berliner klinische Wochenschrift, 19 Nov., 1888. 



10. HtJRTLE. "Beitriige ziu" Kenntnis der Sekretionsvorgiinge in der Schild- 



driise." Pfliiger's Archiv, Bd. 56, 1894. 



11. Andebsson. "Zur Kenntnis d. Morphologic der Schilddriise." Archiv fiir 

 Anat. u. Phys., Anat. Abt., 1894. 



