. The endocrine organs; an introduction to the study of internal secretion . to be found in the rat, although common in many animals.)The vesicles of the thyroid are empty of colloid in this preparation. appear after the tenth year in man. Probably they represent a functionalstage of the ordinary^cells, since transitional forms occur. Both kinds of cell 20 The Endocrine Organs call. contain fatty granules, which increase in number with age; glycogen has also been detected both in the cells and in the interstitial spaces of the gland. Vesicles containing colloid material similar to those of the
. The endocrine organs; an introduction to the study of internal secretion . to be found in the rat, although common in many animals.)The vesicles of the thyroid are empty of colloid in this preparation. appear after the tenth year in man. Probably they represent a functionalstage of the ordinary^cells, since transitional forms occur. Both kinds of cell 20 The Endocrine Organs call. contain fatty granules, which increase in number with age; glycogen has also been detected both in the cells and in the interstitial spaces of the gland. Vesicles containing colloid material similar to those of the thyroid, but usually smaller, are frequently found in the parathyroids. They usually increase in number with age, andoccasionally the colloid is found be-tween the cells, not enclosed withina vesicle. Whether it is of the samechemical nature as that of the thyroidis not established, but it is probablydifferent, as it appears to contain noiodine. After complete removal ofthe thyroid, in the parathyroidswhich had been left colloid-contain-ing vesicles were found by Vincent. conn Clss, FIG. 14.—Section of parathyroid of cat afterprevious removal of thyroid. (Vincent and Jolly ) Vesicles which contain colloid are and jony in considerable number developed within the gland. „ . ml . and ot some size (fig. 14). Ihis observation has been confirmed by Halpenny and Thompson, who foundthat if the animal survives a sufficient time the vesicles become large andirregular (fig. 15),1 presenting a certain resemblance to those of a thyroid
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