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]


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