Thyroid follicle
It is the
structural unit of thyroid gland
Difference
between follicular cells and para-follicular cells
Histologically
Thyroid gland has following parts
1. Capsule
2. Parenchyma (glandular portion )
3. Stroma (supporting structure : connective tissue )
Parenchyma (glandular portion )
Glandular portion is formed by two types of cells
1. Follicular cells
2. Parafollicular cells
These two types of cells formed a definite structure known
as thyroid follicle
Parts of thyroid follicle
It is a round structure contain a lumen and wall of thyroid
follicle is lined by follicular cells and its basement membrane, so follicular
cells are facing toward the follicular lumen.
Some whitish or pale colour bubbles are observed near the
apical region of follicular cells , what is this ?
They are secretory vesicle which contain secretion of
follicular cells and come out from the follicular cell into colloid by the
process of exocytosis
Again secretion of the colloid enter
into the follicular cell by the process of endocytosis.
Parafollicular cells are present peripheral part of
follicular wall but within the basement membrane and it never exposed to lumen
of thyroid follicle
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