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The appendicular skeleton consists of the bones of the pectoral (shoulder) girdle, pelvic (hip) girdle, arms, legs, hands, and feet.

The radius and ulna are parallel to one another and support the forearm. When the body is in the anatomical position, the ulna lies medial to the radius. The trochlear_notch of the ulna articulates with the trochlea of the humerus to create the elbow. The radius is the lateral bone of the forearm. Its head articulates with the capitulum of the humerus.

Radial tuberosity Head Neck Head Radial tuberosity Neck Styloid process Styloid process