. Bulletin. Natural history; Natuurlijke historie. sbcsc sbcs flex. Fig. 25. Left humerus of Corosaurus, based primarily upon UW 5485 and YPM 41033, with inferred points of muscle attachment. A, dorsal (extensor) aspect; B, anterior aspect; C, posterior aspect; D, ventral (flexor) aspect, br = M. brachialis; cbr b = M. coracobrachialis brevis; cbr 1 = M. coracobrachia- lis longus; delt = M. deltoideus (undivided); ext = extensors; flex = flexors; lat d = M. latissimus dorsi; pect = M. pectoralis; sbcsc = M. subcoracoscapularis; sch cr = M. scapulohumeralis cranialis; sup c = M. supracoracoideu
. Bulletin. Natural history; Natuurlijke historie. sbcsc sbcs flex. Fig. 25. Left humerus of Corosaurus, based primarily upon UW 5485 and YPM 41033, with inferred points of muscle attachment. A, dorsal (extensor) aspect; B, anterior aspect; C, posterior aspect; D, ventral (flexor) aspect, br = M. brachialis; cbr b = M. coracobrachialis brevis; cbr 1 = M. coracobrachia- lis longus; delt = M. deltoideus (undivided); ext = extensors; flex = flexors; lat d = M. latissimus dorsi; pect = M. pectoralis; sbcsc = M. subcoracoscapularis; sch cr = M. scapulohumeralis cranialis; sup c = M. supracoracoideus; sup 1 = M. supinator longus; tri h = M. triceps humeralis. plane. The scapulae and ilia are the smallest components of their respective assemblies and the only elements with a significant vertical orientation. The ventral plates and stout median symphyses obviously acted to brace the body cavity against transverse compressive forces generated by the limbs, particularly in the pectrum in those forms with tightly sutured scapuloclavicular assemblies, as discussed by Watson (1924). They were also apparently the points of origin of major locomotor muscles, the positions of which can be crudely estimated. Watson (1924) discussed the possible disposition and function of the pectoral musculature of 'nothosaurs' based primarily upon the pectrum of Nothosaurus and a humerus of ''?Conchiosaurus" (BMNH R. 1409) (probably also Nothosau- rus). The muscle insertion scars of the humerus as interpreted by Watson (1924) were duly figured. Other interpretations of 'nothosaur' humeral musculature position can be seen in studies by F. von Huene (1944, 1956) and Mazin (1985) [and Sues (1987) for Pistosaurus]. As noted in Chapter 2, the known humeri of Corosaurus, complete with muscle scars, also allow a hypothetical, yet Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these
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