. Bulletin. Natural history; Natuurlijke historie. COROSAURUS ALCOVENSIS id cl 47. Fig. 26. Reconstructed pectrum and humeri of Corosaurus with hypothetical musculature (ventral aspect). Right half of figure, deep musculature; left half, superficial musculature, cbr b = M. cora- cobrachialis brevis; cbr 1 = M. coracobrachialis longus; cl = clavicle; cor = coracoid; delt c = M. deltoideus clavicularis; h = humerus; icl = interclavicle; lat d = M. latissimus dorsi; pect = M. pectoralis; sc = scapula; sch cr = M. scapulohumeralis cranialis; sup c = M. supracoracoideus. reconstruction of pectoral
. Bulletin. Natural history; Natuurlijke historie. COROSAURUS ALCOVENSIS id cl 47. Fig. 26. Reconstructed pectrum and humeri of Corosaurus with hypothetical musculature (ventral aspect). Right half of figure, deep musculature; left half, superficial musculature, cbr b = M. cora- cobrachialis brevis; cbr 1 = M. coracobrachialis longus; cl = clavicle; cor = coracoid; delt c = M. deltoideus clavicularis; h = humerus; icl = interclavicle; lat d = M. latissimus dorsi; pect = M. pectoralis; sc = scapula; sch cr = M. scapulohumeralis cranialis; sup c = M. supracoracoideus. reconstruction of pectoral muscle insertions (Fig. 25). The positions of presumably homologous muscles are drawn from comparison with modern reptiles and birds (, Howell 1936; Jenkins and Goslow 1983; Romer 1944; Romer and Parsons 1977; Schreiweis 1982). Muscle relationships are relatively standardized in these groups. Nomenclature is largely that of Romer (1922, 1944). For the most part, the present humeral reconstruction differs little from that of Watson (1924). However, the M. latissimus dorsi seems to have been positioned far more dorsally in Corosaurus; more as shown by Watson (1924) for Plesiosaurus dolichodeirus. The M. scapulohumeralis cranialis of Corosaurus also lies in a position similar to that of P. dolichodeirus. The large scar assumed by Watson (1924) to represent the insertion of this muscle in ''?Conchiosaurus'' probably marks the site of origin of the M. brachialis. The insertion of the M. coracobrachia- lis brevis appears to be located somewhat more proximally in Corosaurus than in '''?Conchiosaurus" No obvious scar exists for the M. coracobrachialis longus in Corosaurus, but this is presumed to have inserted along the mediodistal ventral face of the humerus. Watson (1924) has shown the M. coracobrachialis longus to have been present in ''?Conchiosaurus" and a distinct scar for this muscle occupies a similar position in Lanosaurus (Mazin 1985). The insertions of the M. p
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