Plate XV. — Left Radius and Ulna 



A. — INNliR ASIMXT 

 I. Summit of olecranon process. 2. Beak of ulna. 3. Slightly concave inner surface of olecranon. 4. Sigmoid cavity. 

 5. Body of ulna. 6. Superior articular surface of radius. 7. Radioulnar arch. 8. Bicipital tuberosity. 9. Roughened 

 elevations for attachment of supra-carpal band of flexor perforatus. 10. Sliaft of radius. 11. Roughened ridge for 

 attachment of posterior common ligament of knee. 12. Groove for tendon of extensor metacarpi obliquus. 13. Facet 

 for articulation with scaphoid. 



B OUTKR ASPECT 



I. Summit of olecranon process. 2. Beak of ulna. 3. Convex outer surface of olecranon. 4. Sigtnoid cavity. 

 5. Roughened area for attachment of external arciform ligament. 6. Roughened area for attachment of external lateral 

 ligament of elbow. 7. Radioulnar arch. 8. Bicipital tuberosity. 9. Bcdyofulna. 10. Shaft of radius. 11. Groove 

 for passage of tendon of extensor sufTraginis. 12. Groove for tendon of extensor pedis, 13, Facet for pisiform bone. 

 14. Roughened area for attachment of external lateral ligament of knee. 15. Facet for cuneiform bone. 



