[See Images of Our Closest Human Ancestor] You ... spent reduced time in trees and learned to throw weapons. However, the human shoulder possesses a unique combination of features that makes ...

[Image Gallery: Our Closest Human Ancestor] "When humans throw ... that humans stretch the tendons and ligaments crossing their shoulder and store elastic energy. When this energy is released ...

Image via Flickr user ... While throwing a ball, a person’s shoulder can rotate extremely fast—at 9000 degrees per second, it’s the fastest movement found in the human body—and the ...

MRI of a human shoulder, with rotator cuff, highlighted. Image Credit: Peter Porrini / Shutterstock.com Rotator cuff tear represents one of the most common shoulder injuries in adult patients and ...

The shoulder muscles are responsible for maintaining the widest range of motion of any joint in your body. This flexibility is also what makes the shoulder prone to instability and injury.

“The best models we have are dissected human bodies,” she says. Anatomical studies of the shoulder. Image Credit: Wikimedia Commons, Leonardo da Vinci. The bodies are donated to the school ...

The cells were then allowed to grow over a two-week period, during which the shoulder was activated for 30 minutes each day, bending, pulling and twisting in human-like ways.