Figure 6c. Coronal views of the MCP joints of the second and third fingers in extension, with anatomic correlation. T1-weighted spin-echo (a) conventional MR image (500/12) and (b) MR arthrogram (500/12) and (c) the corresponding anatomic specimen show the proximal (black arrowheads in a and b) and distal (straight arrows) attachments of the main collateral ligament. Note the heterogeneous signal intensity of the main collateral ligaments. The interosseous tendons (white arrowheads) are well demonstrated. Note the intermetacarpophalangeal spaces (curved arrows in c) between the main collateral ligaments and the interosseous tendons.