Follicular lumen

The follicular lumen is the fluid-filled space within a follicle of the thyroid gland. There are hundreds of follicles within the thyroid gland. A follicle is formed by a spherical arrangement of follicular cells. The follicular lumen is filled with colloid, a concentrated solution of thyroglobulin and is the site of synthesis of the thyroid hormones thyroxine (T4) and triiodothyronine (T3).[1]

References
  1. The Thyroid Follicle Archived 2013-01-23 at Archive.today, Endocrinology by J. Larry Jameson, MD, PhD and Leslie J. De Groot, MD, chapter 72




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