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Any explanation always starts with the body in anatomical position. The hands/forearms are supine (palm facing up like you're holding a cup of soup). This would make the pinky (and ulnar bone) medial with the thumb (and radius bone) lateral. At the elbow joint there is a lateral and medial epicondyle (a projection of the humerus where the forearm extensor and flexor muscles attach respectively). For lateral and medial positions this only really affects the forearm/hand since everything else is straightforward.

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