The sternum, also known as the breastbone, is a vital component of the ribcage and plays a crucial role in maintaining the stability of the thorax. It serves as the origin point for several muscles, which are responsible for various movements of the head, neck, and arms. This long, flat, and narrow bone serves a protective function by safeguarding essential organs such as the heart, blood vessels, and glands located within the chest cavity.
What is the Manubrium?
The manubrium is the uppermost section of the sternum, which is the breastbone. It is shaped like a quadrangle and is located at the top of the sternum. The manubrium has the jugular notch at its highest point and clavicular notches on both sides. Additionally, the first pair of ribs is connected to the manubrium through costal cartilage.
Mesosternum: The Central Part of the Sternum
The mesosternum, also known as the central part of the sternum, plays a crucial role in the structure of the chest. It is the longest segment of the sternum and is characterized by its flat shape and ridges along the sides.
These ridges serve as attachment points for the third, fourth, fifth, sixth, and seventh ribs, which are connected to the mesosternum through costal cartilage. The sternal angle, located just above the third rib, serves as the attachment point for the manubrium and the second rib.
The mesosternum’s robust structure and strategic attachment points contribute to the stability and flexibility of the chest, allowing for smooth movement and protection of vital organs.