GENERAL HISTOLOGY

Detailed explanation-1: -The thymus is at its largest and most active during the neonatal and pre-adolescent periods. After this period the organ gradually disappears and is replaced by fat.

Detailed explanation-2: -The thymus makes white blood cells called T lymphocytes. These are also called T cells. These are an important part of the body’s immune system, which helps to fight infection. The thymus gland grows to its largest size during childhood and makes all the T cells we need before we become teenagers.

Detailed explanation-3: -In the thymus they undergo a process of maturation, which involves ensuring the cells react against antigens ("positive selection"), but that they do not react against antigens found on body tissue ("negative selection"). Once mature, T cells emigrate from the thymus to provide vital functions in the immune system.