2. Proximal Extremity

At the elbow end, known medically as the proximal extremity, the radius possesses a head with a cylindrical shape, as well as a neck and a radial tuberosity. On the upper area of the head is a shallow cup that allows for movement of the elbow joint. Most of the head of the radius is smooth, including the neck, which supports the head. Beneath these areas is the radial tuberosity, with two regions for muscle insertion, one rough and one smooth.

elbow joint radius PeopleImages / Getty Images


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