Thyroid Gland
  • 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.