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Thymus. The thymus is a lymphoid gland comprised of two identically sized lobes, located behind the sternum (breastbone) but in front of the heart. It derives its name from a resemblance it bears to the bud of the thyme plant (thymus in Latin). At puberty, the thymus reaches the height of its use, becoming its largest.
The thymus gland lies in the anterior part of the thoracic cavity. It extends from the inferior part of the neck to the superior mediastinum. It lies posterior to the manubrium of the sternum (breastbone) and variations in size may see it extend into the upper part of the inferior mediastinum (below the sternal angle).he thymus gland is most active in early life and this is reflected in its weight â 20 to 30 grams at birth, 30 to 50 grams up until puberty and 5 to 15 grams in old age. Its size at birth is approximately 50 millimeters in length and 40 millimeters in width with a variable thickness of about 6 millimeters.