. The endocrine organs; an introduction to the study of internal secretion . he thyroid,1 but usually in man both areclosely attached to it. The upper of the parathyroids may be completelyembedded in the substance of the thyroid (fig. 13). The parathyroids were described by Sandstrom in 1880. Their plwsio-logical independence and distinction from the thyroid proper was first re-cognised by Gley in 1891, and confirmed by Vassale and Generali in 1896,but is not fully accepted by Forsyth, Vincent, and some other authorities. 1 This is constantly the case, as Gley pointed out, in the rabbit, and p
. The endocrine organs; an introduction to the study of internal secretion . he thyroid,1 but usually in man both areclosely attached to it. The upper of the parathyroids may be completelyembedded in the substance of the thyroid (fig. 13). The parathyroids were described by Sandstrom in 1880. Their plwsio-logical independence and distinction from the thyroid proper was first re-cognised by Gley in 1891, and confirmed by Vassale and Generali in 1896,but is not fully accepted by Forsyth, Vincent, and some other authorities. 1 This is constantly the case, as Gley pointed out, in the rabbit, and partly accountsfor the fact that when thyroidectomy is performed in that animal, two parathyroids beingleft behind, tetany does not occur until these are removed. Even then tetany sometimesfails to show itself ; this may perhaps be accounted for by the presence of accessory para-thyroids in the thymus. Structure of Parathyroids 17 The parathyroid is composed of epithelium-like cells (figs. 7 to 13), whicheither form a compact mass (fig. 7) or are divided up into lobules or. FIG. 8. —Section of parathyroid of dog. Magnified 400 diameters. This showsa looser arrangement of the trubecula? than the gland represented in fig. the right is part of one of the vesicles of the thyroid.
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