The thyroid gland or thyroid is a butterfly-shaped organ that belongs to the endocrine system or the system of hormoonuitscheidende organs.

The thyroid gland is located at the height of the front side of the larynx in the neck, just below the Adam's apple. It is a very highly vascularised organ that consists of 2 lobes. The lobes are composed of follicles (vesicles). Between the follicles of the thyroid gland are the parafolliculaire cells, the so-called C-cells. The thyroid gland is supplied with blood by four arteries, making it the most perfused organ of the human body.

Against the thyroid are the parathyroid glands or parathyroïden. These are 4 separate organ boys who also belong to the endocrine system.

The thyroid is a vital organ, without the thyroid and the hormones they secrete, we can not live. The secretion of thyroid hormones is regulated by various factors. The main factor comes from the hypothalamus, an area in the brains that play an important role in the regulation of homeostasis, the balance of the body substances.


Man Gay sapiens or a bipedal primate species in the family Hominidae. Research suggests that modern humans about 200,000 years ago in Africa emerged as a species. Humans have highly developed brains, which he is capable of abstract thinking, language, introspection, problem solving and emotion. Thanks to his intelligence and upright posture, allowing the arms to be free to pick up objects and manipulate, the man much more than other species able to use tools.