The thymus is a flattened, bilobed structure lying between the sternum and the pericardium in the anterior mediastinum. In the newborn infant, the thy­mus reaches its largest size relative to the size of the body, at which time it may extend up through the superior me­diastinum in front of the great vessels into the root of the neck. The thymus continues to grow until puberty but thereafter undergoes involution. It has a pink, lobulated appearance and is the site for the development of thymus processed lymphocytes, T (thymic) lymphocytes, which are distributed to the whole body.

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