Plate XIII.— The Humerus 



A. — Li;i-T HUMKRUS, ANTERIOR ASI'KCT 



I. Anterior division ol internal luberosily. 2. Bicipital groove. 3. Internal tubercle ifor attadimcnt of teres major 

 and latissinius dorsii. 4. Ridges for attachment of coraco-hunieralis muscle. 5. Coroiioid fossa. 6 and 7. Inferior 

 articular surface. 8. Pit for origin of extensor metacarpi magnus and e.xtensor pedis. 9. Musculo-spiral groove. 

 10. Ridge for attachment of mastoido-humeralis. 11. Deltoid tubercle. 12. Deltoid ridge. 13. Anterior division 

 (summit) of e.Nternal tuberosity. 14. Mesial ridge of bicipital groove. 



B.— LEFT HUMERUS, POSTERIOR ASPECT 

 I. Convexity of external tuberosity. 2. Deltoid ridge. 3. Deltoid tubercle. 4. External condyle. 5. Surface for 

 articulation with sigmoid cavity of ulna. 6. Pit for attachment of external lateral ligament of elbow. 7. Roughened 

 area for origin of flexor metacarpi externus. 8. Roughened area for origin of flexor perfoi atus and humeral head of 

 fle.xor perforans. 9. Olecranon fossa. 10. Internal condyle. 11. Internal tubercle. 12. Musculo-spiral groove. 

 13. Roughened ridge for attachment of caput medium. 14. Articular head. 15. Posterior division of internal tuberosity. 



