Which bone articulates with the sternum and scapula?

The bone that connects with both the sternum and the scapula is the clavicle, also known as the collarbone.

Here's how it works:

1. The clavicle connects to the sternum at one end. This joint is called the sternoclavicular joint. It's like a bridge that connects your sternum, the center of your chest, to your shoulder.

2. On the other end, the clavicle connects to the scapula, which is your shoulder blade. This joint is called the acromioclavicular joint.

So, the clavicle acts like a strut between the sternum and the scapula, allowing your arms to move freely while keeping your shoulders in line with your body. It's like the crossbar of a bicycle that connects the handlebars to the seat, allowing you to steer and balance.