Plate XIII. — The Humekus 



A.— LEFT HUMERUS, ANTEKIOR ASPECT 



r. Anterior division of internal (uberosity. 2. Bicipital groove. 3. Internal tubercle (for attarlmient of teres niaior 

 and latissimus dorsi). 4. Ridges for attachment of coraco-hunieralis muscle. 5. Coronoid fossa. 6 and 7. Inferior 

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

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

 (summit) of external tuberosity. 14. Mesial ridge of bicipital groove. 



B. — LE1''T HUMERUS, I'O.STERIOR A,SrECT 



1. Convexity of external tuberosity. 2. Deltoid ridge. 3. Deltoid tubercle. 4. I'^xternal condyle 



articulation with sigmoid cavity of ulna. 6. I'it for attachment of external lateral ligament of elbow 



area for origin of flexor metacarpi externus. 8. Roughened area for origin of flexor perfoiatus and liumeral liead of 



flexor peiforans. 9. Olecranon fossa. 10. Internal condyle. 11. Internal tubei'cle. 12. Musculo-spiral groove. 



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



5. Surface for 

 7. Rotighcned 



