The radius is the medial bone of the antebrachium.

Question

BlackTom AI · Accepted Answer

Statement evaluation begins by identifying the anatomical terminology involved.
Option 1 (True): The claim that the radius is the medial bone of the antebrachium is incorrect. In standard anatomical position, the radius is the lateral bone of the forearm (antebrachium), located on the thumb side, while the ulna is the medial bone on the pinky side.
Option 2 (False): The statement is false because the radius is not medial; it is the lateral aspect of the forearm. The two bones, radius and ulna, form the two-bone complex of the antebrachium, with the ulna positioned medially and the radius laterally relative to the body's midline.
Additional nuance: The two bones can cross over each other during pronation, but this positional change does not redefine which bone is anatomically medial or lateral in the standard reference frame. Thus, the medial bone remains the ulna, not the radius.
In summary, since the radius is located laterally and the ulna medially in anatomical position, the statement asserting radii’s mediality is false.

BIOLOGY 211-B09C HW #6: Appendicular Skeleton

The radius is the medial bone of the antebrachium.

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