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Illustration of single thyroid follicle

Illustration of single thyroid follicle

P750/0030

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Credit

JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY

Caption

Illustration of a single human thyroid follicle, the functional unit of the thyroid gland. The follicle has been cut open to reveal the internal layer of epithelial cells surrounding a pool of thyroid colloid (purple). The blood supply is also featured (red & blue). The follicular cells secrete two forms of thryoid hormone, thyroxine (T4) and triiodothyronine (T3), which are stored in the jelly-like colloid. When actively secreting hormones the lining cells are large & cuboidal, & the colloid is diminished. When less active the colloid is distended & the secretory cells flattened.

Release details

Model release not required. Property release not required.

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