The thymus gland is in the upper part of the mediastinum (chest) behind the sternum and extending upwards into the root of the neck. It is a small organ (reaching its maximum weight of about 1 ounce during puberty) that slowly decreases in size during adulthood and is gradually replaced by fat tissue. During fetal development and childhood, the thymus produces white blood cells, called lymphocytes, that travel to lymph nodes (bean-sized collections of immune system cells) throughout the body. There they help the Read more…
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