OSTEOLOGY 



28 



Groove for ulnar nerve 



Capitulum or little head of humerus 



(O. T. capitellum or radial head) 

 Trochlea (" pulley") of humerus 

 Medial epicondyle (O. T. internal con- 



dyle) 

 Lateral epicondyle (O. T. external 



condyle) 

 Olecranon fossa 

 Coronoid fossa 

 Radial fossa 

 Supracondyloid process 



Radius ("spoke") 

 Body of radius, or shaft 

 Head of radius 

 Pit of head of radius 

 Neck of radius 

 Articular circumference 

 Tuberosity of radius (O. T. bicipital 



tuberosity) 

 Interosseous crest (O. T. internal or 



interosseous border) 

 Dorsal surface (O. T. posterior surface) 

 Volar surface (O. T. anterior surface) 

 Lateral surface (O. T. external surface) 

 Dorsal margin (O. T. posterior border) 

 Volar margin (O. T. anterior border) 

 Styloid process 



Ulnar notch (O. T. sigmoid cavity) 

 Carpal articular surface 



Ulna, or elbow bone 



Body of ulna, or shaft 



Olecranon, or point of the elbow 



Coronoid process 



Tuberosity of the ulna 



Semilunar notch (O. T. greater sig- 

 moid cavity) 



Radial notch (O. T. lesser sigmoid 

 cavity) 



Interosseous crest (O. T. external or 

 interosseous border) 



Dorsal surface (O. T. posterior sur- 

 face) 



Volar surface (O. T. anterior surface) 

 Medial surface (O. T. internal surface) 

 Dorsal margin (O. T. posterior border) 

 Volar margin (O. T. anterior border) 

 Ridge of supinator muscle 

 Head of ulna 



Articular circumference 

 Styloid process 



Wrist 



Bones of the wrist 

 Central bone 



Navicular bone of the hand (O. T. 

 scaphoid) 



Tubercle of navicular bone 

 Lunate bone (O. T. semilunar) 

 Three-cornered bone (O. T. cuneiform 



bone) 



Pisiform bone 



Large multangular bone (O. T. tra- 

 pezium) 



Tubercle of large multangular bone 

 Small multangular bone (O. T. trape- 



zoid) 



Capitate bone (O. T. os magnum) 

 Hooked bone (O. T. unciform) 



Hook of os hamatum 

 Radial eminence of wrist 

 Ulnar eminence of wrist 

 Carpal sulcus 



Metacarpus 



Metacarpal bones I V 



Base 



Body, or shaft 



Head 

 Third metacarpal bone 



Styloid process 



Phalanges of the fingers 



First phalanx 

 Second phalanx 



