A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . Fio. 6239. FIG. 5240. O, glottis;. tlir. Fig. 5237.—Pharynx, Thyroid, and Tlivnnis of a Human Embryo,X 25. (From Quain, after His.) (c, tongue; fc., foramen ciEcum;cp., epiglottis; Him., thymus; (fir., median thyroid; Oir, lateralthyroid; (!, ductus thyreoglossus. and 5238). According to His, it remains a vesicle forquite a long time, and the separation from the pharynxoccurs quite late or may not take place at all. Later, how- FIGS. 5239 AND 5240.—Diagrams of Two S
A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . Fio. 6239. FIG. 5240. O, glottis;. tlir. Fig. 5237.—Pharynx, Thyroid, and Tlivnnis of a Human Embryo,X 25. (From Quain, after His.) (c, tongue; fc., foramen ciEcum;cp., epiglottis; Him., thymus; (fir., median thyroid; Oir, lateralthyroid; (!, ductus thyreoglossus. and 5238). According to His, it remains a vesicle forquite a long time, and the separation from the pharynxoccurs quite late or may not take place at all. Later, how- FIGS. 5239 AND 5240.—Diagrams of Two Stages of the Development of the LateralThyroids. (Slightly modifled from Bom.) R, Border of the pharynx ; I., thymus;, lateral thyroids. probabilitj described them from time to time. The truemeaning of them was fully made out by Born and by deMeuron, the former having discovered that they unitewith the median thyroid in mammals, the latter havingstudied them from a comparative standpoint. Diagramsof the branchial pockets for some of the different classesof vertebrates are given in the article Thymus, and bythem it is shown that a rudimentary branchia
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