The thyroid gland has a right and a left lobe.
They are connected in the middle by an isthmus. (See Gross Anatomy Thyroid)
Each lobe is in turn is divided into lobules by septae dipping from the capsule.
The thyroid lobules consist of a large number of thyroid follicles.
They synthesize and secrete thyroid hormone. Thyroid hormones include thyroxine (T4)x and triiodothyronine (T3).
In between these thyroid follicles or within the wall of the thyroid follicles are small C cells, also know as parafollicular cells.
They secrete polypeptide hormone known as calcitonin.