The first pair of ribs forms a joint with which part of the sternum?

The first pair of ribs articulates with the manubrium, which is the uppermost part of the sternum. This joint formation is significant as it contributes to the stability and structure of the rib cage. The connection helps protect vital organs, such as the heart and lungs, while also allowing for some movement during respiration.

The manubrium features a concave shape that provides a suitable surface for the head of the first rib to fit into. This articulation is important in various movements, including breathing, as it maintains the integrity of the thoracic cavity.

Understanding the anatomy of the sternum and its associated structures is vital for comprehending the biomechanics involved in thoracic movement and the physiological functions of the rib cage.