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胸腺是一个不被人注意的器官,它位于胸骨柄的后方、纵膈上部,紧贴在气管的前面。在胚胎发育早期,胸腺与甲状腺同出一源。出生后,胸腺迅速发育并逐渐移居于胸骨后。出生时胸腺重约15克,至青春期达到高峰,重量约为30—40克,青春期后便逐渐退化和萎缩,老年人的胸腺多在10克以下,只有青春期的四分之一,有时甚至仅遗留腺体残迹。由此可见,胸腺是人体中“寿命”较短的器官,它成熟最早,
The thymus is an unnoticeable organ that sits behind the sternum, above the mediastinum, in front of the trachea. In the early stages of embryonic development, the thyroid gland and thyroid are the same source. After birth, the thymus rapidly develops and gradually migrates behind the sternum. Thymic birth weight of about 15 grams, to reach its peak in adolescence, weighing about 30-40 grams, after puberty will gradually degenerate and shrink, the elderly more than 10 grams of thymus, only a quarter of puberty, and sometimes even only Residual gland remnants. Thus, the thymus is the body's “life” of the shorter organs, it is the earliest maturity,