He thymus gland is actually composed of lymphoid tissue and is located in the mediastinal cavity, in front of and above the

The thymus gland is actually composed of lymphoid tissue and is located in the mediastinal cavity, in front of and above the heart.
The thymus gland is a two-lobe primary lymphoid organ which has an important role in immune function. It secretes thymosin hormone which stimulates the maturation of T cells. So, the thymus is a place where T cells mature. This organ is most active during the neonatal and pre-adolescent periods.