. The biology of the amphibia. Amphibians. THE MUSCULAR SYSTEM 255 conditions may be more larval than primitive. In some urodeles and frogs the lateral portion of the sternohyoideus may form a distinct omohyoideus as in higher vertebrates. Forelimb Muscles.—The forelimbs of the earliest tetra- pods were held more or less at right angles to the body and the. Fig. 94.—Ventral body muscles of Liopelma showing the cartilaginous abdomi- nal ribs which occur in this primitive frog. , abdominal ribs; , coracobrachial brevis; , coracobrachialis longus; , coracoradialis proprius;
. The biology of the amphibia. Amphibians. THE MUSCULAR SYSTEM 255 conditions may be more larval than primitive. In some urodeles and frogs the lateral portion of the sternohyoideus may form a distinct omohyoideus as in higher vertebrates. Forelimb Muscles.—The forelimbs of the earliest tetra- pods were held more or less at right angles to the body and the. Fig. 94.—Ventral body muscles of Liopelma showing the cartilaginous abdomi- nal ribs which occur in this primitive frog. , abdominal ribs; , coracobrachial brevis; , coracobrachialis longus; , coracoradialis proprius; D., deltoideus; Gl., lymphoidal gland, , pectoralis abdominalis; , pectoralis sternalis; , supracoracoideus. sharply bent forearms supported the weight. The humerus was advanced and the forearm extended, or the humerus brought posteriorly and the forearm flexed. The musculature of the forelimb, as far as it may be judged by the form of the limb and girdle, consisted of a ventrolateral and a dorsomedial group of muscles, which Romer (1924) has homologized with the muscle masses found one on either side of the anterior fins of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Noble, Gladwyn Kingsley, 1894-1940. New York : McGraw-Hill
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Keywords: ., bookcentury1900, bookpublishernewyorkmcgr, booksubjectamphibians
