Muscles move the humerus. The humerus is your upper arm bone. It is the only bone in the upper arm, and it is also the largest bone in the upper extremity. The top of the humerus joins with an ...

New fossil evidence suggests echidnas evolved from a water-dwelling ancestor, not a land-based one. The bone structure ...

Outward arm action in a jumping jack Rotator cuffs A group of stabilising muscles of the shoulder which helps to prevent dislocation and allows the shoulder to rotate the humerus around its own ...

Airplane wings are modeled after bird wings. The bones and muscles of the wing are also highly specialized. The main bone, the humerus, which is similar to the upper arm of a mammal, is hollow ...