In a discovery that rewrites our understanding of human evolution ... the distal shaft of an adult humerus (lower half of the upper arm bone). “When I first saw the small humerus, I thought ...

anamensis' jaws are more primitive than those of later hominids. And yet, its humerus (an arm bone) is quite human-like. Characteristics of its tibia (a lower leg bone) indicate that A.

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 ...