Comment on Acini of thyroid gland

Explanation

Acini of Thyroid gland
1. The butterfly shaped tyroid gland is a bilobed gland located below the larynx on each side of upper trachea Its two lateral lobes are connected by a medium tissue mass called Isthmus
2. Each lobe is made up of many lobules The lobules consist of follicles called acini (acinus In singular )
3. Each acinius is lined with glandular cuboida or squamous epithelial cells
4. The lumen of acinus is filled with colloid a thick glycoprotein mixture consisting of thyroglobulin molecules
5. Hormones of the thyroid gland are often called the major metabolic harmones
6. The folicular cells of thyroid gland secretes two hormons namely tri-iodothyronine `(T_3)` and thyroxine or etre-iodthyronine ` (T_4)`
7. The parafollicular cells or 'C' cells of thyroid gland secrete a hormone called thyrocalcitonin
8. Iodine is essential for the normal synthesis of thyroid hormones