Abstract
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.
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© 1992 Springer Science+Business Media New York
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Fujita, H., Imada, M. (1992). Blood Vascular Casts of the Thyroid Gland in Normal and Experimental Conditions. In: Motta, P.M., Murakami, T., Fujita, H. (eds) Scanning Electron Microscopy of Vascular Casts: Methods and Applications. Electron Microscopy in Biology and Medicine, vol 10. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3488-4_17
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DOI: https://doi.org/10.1007/978-1-4615-3488-4_17
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