Thyroid gland is located just below the larynx.

Composed of two lobes connected by an isthmus.

The gland consists of numerous spherical hollow sacs called thyroid follicles.

Follicles are lined with simple cuboidal epithelium that are esponsible for the production of thyroid hormone.

The interior of the follicles contains colloid - a protein rich fluid.

Between the follicles there exists group of cells called the parafollicular cells that are responsible for production of Calcitonin - a hormone involved in calcium and phosphate homostasis.