Blood Vascular Casts of the Thyroid Gland in Normal and Experimental Conditions

  • Hisao Fujita
  • Masato Imada
Part of the Electron Microscopy in Biology and Medicine book series (EMBM, volume 10)


The thyroid gland is generally covered by a capsule of connective tissue that is continuous with the interlobular and interfollicular connective tissue. However, in the small-sized thyroids of lower vertebrates and small-sized mammals, the lobular unit is not so distinct. In almost all the vertebrates, the thyroid gland consists of numerous ball-like structures called follicles, and of interfollicular connective tissues with blood capillaries. Each follicle is composed of numerous follicular epithelial cells arranged as a simple cuboidal epithelium to surround a lumen, and a few parafollicular cells located singly or in groups in the basal part of the follicular epithelium. Each follicular lumen surrounded by the follicular epithelium is a completely enclosed area, storing colloidal materials (thyroglobulin) secreted by the follicular epithelial cells.


Thyroid Gland Blood Capillary Follicular Epithelium Follicular Epithelial Cell Parafollicular Cell 
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Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • Hisao Fujita
    • 1
  • Masato Imada
  1. 1.Department of AnatomyOsaka University Medical SchoolSuita-city, Osaka-fuJapan

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