Superior Mediastinum:
* Thymus gland: This is an important part of the immune system, especially in childhood.
* Great vessels: These include the aorta (the main artery carrying blood from the heart), the superior vena cava (the main vein returning blood to the heart from the upper body), and the brachiocephalic veins.
* Trachea: The windpipe, which carries air to the lungs.
* Esophagus: The tube connecting the throat to the stomach.
* Phrenic nerves: These nerves control the diaphragm, the muscle that helps you breathe.
* Vagus nerves: These nerves control various functions, including heart rate, digestion, and breathing.
Inferior Mediastinum:
This is further divided into the anterior, middle, and posterior mediastinum:
Anterior Mediastinum:
* Fat: This helps cushion and protect the organs in the mediastinum.
Middle Mediastinum:
* Heart: The central organ of the circulatory system, responsible for pumping blood throughout the body.
* Pericardium: The sac that surrounds the heart.
Posterior Mediastinum:
* Descending aorta: This is the continuation of the aorta that carries blood to the lower body.
* Esophagus: The tube connecting the throat to the stomach.
* Thoracic duct: This is the largest lymphatic vessel in the body, which collects lymph fluid from the lower body and returns it to the circulatory system.
* Azygos vein: This vein collects blood from the back and chest walls and drains into the superior vena cava.
It's worth noting that there is some overlap between the superior and inferior mediastinum, particularly with the esophagus, trachea, and great vessels. The specific location of these structures can vary slightly between individuals.
