. Bulletin of the Natural Histort Museum. Geology series. CHURCHILL. Fig. 13 Right ulna, , natural size. 13A, anterior: 13B, lateral; 13C, posterior. process on the volar surface. The dorsal and medial surfaces are complete distally to well past midshaft. Only portions of the volar surface of the shaft are preserved. The lateral surface of the shaft is the best preserved, and is almost completely represented from the proximal end down to the level of the M. pronator qitadratiis crest distally. The trochlear notch opens anteroproximally (the coronoid proc- ess is much higher th
. Bulletin of the Natural Histort Museum. Geology series. CHURCHILL. Fig. 13 Right ulna, , natural size. 13A, anterior: 13B, lateral; 13C, posterior. process on the volar surface. The dorsal and medial surfaces are complete distally to well past midshaft. Only portions of the volar surface of the shaft are preserved. The lateral surface of the shaft is the best preserved, and is almost completely represented from the proximal end down to the level of the M. pronator qitadratiis crest distally. The trochlear notch opens anteroproximally (the coronoid proc- ess is much higher than the olecranon) (Table 8 and Fig. 14). There is a distinct ridge separating the coronoid and olecranon articular surfaces in the trochlear notch, and there appears to be a small outgrowth of bone just distal of this ridge (on the coronoid articular surface) near the centre of the trochlear notch. There is no indication of degenerative changes to any of the proximal articular surfaces (including the preserved portion of the radial notch). The proximal surface of the olecranon process is not very rugose, but vertical striations can be seen on the dorsal margin along the M. triceps brachii insertion. The area of the M. anconeus insertion is weathered and broken, but what is preserved of the muscle scar is non-rugose. The morphology of the proximal M. supinator crest cannot be evaluated because of damage to the medial shaft below the radial notch, but this muscle often extends distally well below the level of the M. brachialis scar and may overlap the proximal end of the interosseus crest. In the case of , the distal portion of the muscle attachment can be seen on the proximal shaft, where it is slight but clear, indicating a moderate-to-strong development of the supinator muscle. Only the distal half of the M. brachialis scar is preserved, which appears as a well defined, raised scar with clear borders. There is a thin yet clear crest for M. pronator teres, but no clear o
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