We have the veins known as our internal jugular veins and we also have our arteries known as our common carotid artery. We have the right one and we have the left one. So essentially what the thyroid gland is, it's an endocrine gland that produces hormones that is located on the front portion of the windpipe and it also extends slightly towards the back. Now, there are two types of cells that we're going to discuss in just a moment that are responsible for producing three types of hormones. We have T three, also known as the triadothyrene hormone. We have the T four, also known as the thyroxine hormone, and we have our calcitonin.