Radius

Radius

Features:

• The proximal end of the radius articulates with the humerus

• The proximal epiphysis of the human radius begins to fuse around 14 years of age and is completely fused around 19 years of age

• The distal epiphysis of the human radius begins to fuse around 17 years of age and is completely fused around 22 years of age

• The cup-shaped head at the proximal end of a human radius allows the radius to rotate across the ulna when the hand rotates

• In some non-humans, the radius and ulna are fused together

Human vs. Non-human Comparison:

• Cup-shaped head is a distinct feature of human radii compared to most non-human radii