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The medial epicondyle is the most medial structure of the humerus. The trochlea is the second.
The ulna is not a midline structure. It is, however, the most medial bone of the forearm.
The distal process on the medial tibial surface is the "medial malleolus".
The acromion process is the most superior medial aspect of the scapula. It articulates with the clavicle.
gracilis
Cochlea
Lateral
The medial surface of the tibia is the part that faces the other leg. It is the most superficial of the tibia's surfaces.
The Lacrimal bone.
The breastbone (sternum), is just about the most medial (towards the mid-line) structure of the body.
The Capitate and the Trapezoid
Medial rotation of the forearm is called pronation in its broadest sense, so "medial rotation of the arm" most probably refers to movement at the shoulder.The best example is if you flex your forearm at 90° to your arm, and you bring your hand to your midline, this is medial rotation of the arm at the shoulder.Medial rotation of the arm is the rotation of the humerus(arm bone) around its long axis (imagine a line from elbow to shoulder).