GOUGH'S CAVE PECTORAL GIRDLE AND UPPER LIMBS 



103 



Figs 6, 7 Cough's Cave 1 ulnae, in ventral (a), medial (b). dorsal (c) and lateral (d) views; 6, right-side ulna; 7, left-side ulna; x 0.5. 



Fig. 8 Cough's Cave 1 right ulna in lateral view; x 1. 



M. anconeus inseilion area is mildly rugose, occupying a narrow 

 ridge (between the medial and lateral surfaces of the proximal shaft) 

 on the dorsal surface of the shaft. This mildly rugose line continues 

 distally until it joins with the line marking the aponeurotic attach- 

 ment of M. flexor digitorum profundus, M. flexor carpi ulnaris and 



M. extensor carpi ulnaris. Supinator crests of both sides are well 

 developed, beginning as pronounced crests arising from the 

 inferodistal margins of the radial notches (Fig. 8). The crests con- 

 tinue distally to a half centimeter or so below the M. hrachialis scar, 

 where they stop and then resume again another 10-20mm distally. 

 The distal portions of the M. supinator ridges follow the interosseous 

 crests (lying just posterior to and on the lateral surface of the 

 interosseous crests), about one-third of the way down the shaft. The 

 posterior edge of the proximal portion of the M. supinator attach- 

 ment area is also marked by a crest on the lateral surface below the 

 trochlea. The M. hrachialis scars are moderately rugose, and present 

 themselves as small raised patches (roughly 13mm proximodistally 

 X 9mm mediolaterally on both sides). The area between the scars and 

 the coronoid processes is mildly rugose. No markings are evident on 

 either side for M. pronator teres. There is a large tubercle present on 

 the anteromedial corner of the coronoid process in the area of the 

 origin of the ulnar head of M. flexor digitorum supeificialis on the 

 right-side. This area is somewhat damaged in the left-side ulna, but 

 it is certain that the tubercle, if indeed it existed, was not nearly as 

 large as that of the right. 



