Recent advances in endocrinology / by A.T. Cameron.

  • Alexander Thomas Cameron
Date:
1947
Catalogue details

Licence: In copyright

Credit: Recent advances in endocrinology / by A.T. Cameron. Source: Wellcome Collection.

    18/466 page 6
    CHAPTER II THE THYROID GLAND Introduction Iodine and the thyroid gland The thyroid hormone Studies with radioactive iodme The function of the thyroid PAGE 6 8 13 16 18 INTRODUCTION The thyroid gland is built up of a large number of follicles of varying size and shape but tending to be spheroidal (cf. Fig. 1). Fig. 1. Top and side view of wax model of normal human thyroid gland. (From Rienhoff, Medicine, 1931, x, 293.) Follicles measuring 0-05 to 0*12 mm. in length predominate in the human gland. Each consists of a closed vesicle containing colloid material and lined with epithelium, the cells of which are columnar, cubical or flattened, according to the state of activity of the gland and degree of distension of the vesicles. The intervesicular sub¬ stance is areolar tissue, which may contain lymphocytes and other cells, including epithelial cells (Sharpey-Schafer ; Jackson). The lymphatic system of the gland is a closed system, playing no role in the transmission of its hormone (Rienhoff). In early foetal life vesicles develop from solid epithelial masses ; a little later colloid is produced and is stored in them. After birth secretory activity is marked throughout infancy and childhood ;
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