Ulna and Radio

and radius are the two long and even bones of the human body, which form the skeleton of the forearm.

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Bordering the humerus, in the proximal position, and with the wrist bones, in the distal position, the ulna and radius are anatomically and physiologically important for their contribution to the important elbow and wrist joints.
Like all bones in the human body, the ulna and radius can also be fractured.

between the upper arm and the lower hand (assuming, obviously, that the natural position of the lower limb is along the side and with the hand facing downwards).

is the antero-posterior division of the human body from which two equal and symmetrical halves derive, "medial" means "near" or "closer" to the sagittal plane, while "lateral" means "far" or "farther" from the plane sagittal.
Examples:

• The second toe is lateral to the big toe, but medial to the third toe.
• The tibia is medial to the fibula, which is lateral to the tibia.