The function of the gland is to make the thyroid hormone, thyroxine. When the gland is looked at under a microscope, many small ‘follicles’ can be seen; these are islands of tissue containing collections of colloid, a protein substance to which thyroid hormone is bound and from which it can be released by enzymes.
The thyroid gland is found in the neck, just below the level of the larynx. There are two lobes to the gland, and these lie just in front and at either side of the trachea as it passes down the front of the neck. The two lobes are connected by a small bridge of tissue, and there may be a smaller central lobe called the pyramidal lobe. In an adult, the gland will weigh about 20 gm (2/3 oz).
The function of the gland is to make the thyroid hormone, thyroxine. When the gland is looked at under a microscope, many small ‘follicles’ can be seen; these are islands of tissue containing collections of colloid, a protein substance to which thyroid hormone is bound and from which it can be released by enzymes.
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