Thymic branches of internal thoracic artery

Branches of the internal thoracic artery supplying the thymus

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Latin	Rami thymici arteriae thoracicae internae

The thymic branches of the internal thoracic artery are small arterial branches that supply blood to the thymus, an organ located in the anterior part of the superior mediastinum of the chest. These branches are part of the vascular supply that ensures the thymus receives adequate blood flow for its function in the immune system.

Anatomy

The internal thoracic artery, also known as the internal mammary artery, is a major artery that arises from the subclavian artery. It descends along the inner surface of the anterior chest wall, giving off several branches, including the thymic branches.

The thymic branches typically arise from the internal thoracic artery as it passes near the level of the first to fourth costal cartilages. These branches are usually small and variable in number, reflecting the variable size and position of the thymus, especially as it involutes with age.

Function

The primary function of the thymic branches is to supply oxygenated blood to the thymus. The thymus is a lymphoid organ that plays a crucial role in the development of the immune system, particularly in the maturation of T-lymphocytes (T-cells), which are essential for adaptive immunity.

Clinical significance

Understanding the vascular supply of the thymus is important in surgical procedures involving the mediastinum, such as thymectomy, which may be performed in cases of myasthenia gravis or thymic tumors. Surgeons must be aware of the potential for bleeding from the thymic branches during such procedures.

Also see

• Internal thoracic artery
• Thymus
• Subclavian artery
• Mediastinum