Size & shape The thymus is located just below the breast bone. It is relatively large in infants and grows until puberty. In adulthood, it starts to slowly shrink and become replaced by fat,.

Overactive Thymus Gland. The exact cause of myasthenia gravis needs to be better understood. However, research shows that about 75% of people with MG have an abnormally large and overactive thymus gland (an organ that controls immune function). Researchers suspect the thymus gland may send incorrect instructions to developing immune cells.

The thymus is an organ that is critically important to the immune system which serves as the body’s defense mechanism providing surveillance and protection against diverse pathogens, tumors, antigens and mediators of tissue damage.

Thymus. The thymus is located in the upper part of the chest and produces white blood cells that fight infections and destroy abnormal cells. Adrenal gland. An adrenal gland is located on top of each kidney. Like many glands, the adrenal glands work hand-in-hand with the hypothalamus and pituitary gland.