Follicular lumen

A follicular lumen is the closed cavity within a follicle of the thyroid gland. It is surrounded by follicular cells and filled with colloid, a concentrated solution of thyroglobulin.

Follicular lumen

A follicular lumen is the closed cavity within a follicle of the thyroid gland. It is surrounded by follicular cells and filled with colloid, a concentrated solution of thyroglobulin.