THE RADIUS 



91 



IS correspondingly concave in its length and is flattened in the transverse direction. 

 At its proximal part there is a smooth shallow groove, which concurs with the ulna 

 m the formation of the interosseous space of the forearm (Spatium interosseum 

 antibrachn) ; the nutrient foramen is in the lower part of this groove. Below this 

 there is in the young subject a narrow, rough, triangular area to which the ulna is 



Olecranon 



Processus anconams 



Sem,ilunar notch 

 Humeral articular 

 surface 

 Coronoid ~' 



process 

 Radial tu- 

 berosity 



Olecra. 



Shaft of ulna 



Interosseous 

 space 



Pi ocessus 



nnconceus 

 Sttnilunar notch 



Glenoid cavity 



— ,»- Radial 



tuberosity 



Pig. 67. — Left Radius and Ulna of Horse; Lateral 

 View. 

 1, Tuberosity for attachment of la-teral ligament of 

 elbow joint, and common and lateral extensor muscles; 

 2, tuberosity for attachment of lateral ligament of 

 carpal joint; 3, groove for common extensor tendon; 

 4, groove for lateral extensor tendon. 



Carpal articular 

 s urface 



Fig. 68. — Left Radius and Ulna of Horse; Medial 

 View. 

 1, Tuberosity for attachment of short part of 

 medial ligament of elbow; 2, prominence for long part 

 of same; 3, groove for end of brachialis muscle; 4, 

 tuberosity for attachment of medial ligament of carpal 

 joint; 5, oblique groove for tendon of extensor carpi 

 obliquus. 



attached by an interosseous ligament; in the adult the two bones are fused here. 

 A variable rough elevation distal to the middle and close to the medial border gives 

 attachment to the radial check ligament. The medial border (Margo medialis) 

 is slightly concave in its length and is largely subcutaneous; at its proximal end 

 there is a smooth area on which the tendon of insertion of the brachialis muscle lies, 

 and a small rough area just below gives attachment to that muscle and the long 



