. Comparative anatomy. Anatomy, Comparative. 28o COMPARATIVE ANATOMY Thoracic Muscles. The intrinsic muscles of the thorax are covered by the extensive muscles of the shoulder and chest. When these are removed, the same three muscles found in the abdomen are exposed. The outer of these, corresponding with the external oblique of the abdo- men, is the external intercostal; the internal intercostal is the homologue of the internal oblique of the abdomen; the m. transversus thoracis corre- sponds to the transversus abdominis. In addition to these, an external sheet of muscle which is continuous i
. Comparative anatomy. Anatomy, Comparative. 28o COMPARATIVE ANATOMY Thoracic Muscles. The intrinsic muscles of the thorax are covered by the extensive muscles of the shoulder and chest. When these are removed, the same three muscles found in the abdomen are exposed. The outer of these, corresponding with the external oblique of the abdo- men, is the external intercostal; the internal intercostal is the homologue of the internal oblique of the abdomen; the m. transversus thoracis corre- sponds to the transversus abdominis. In addition to these, an external sheet of muscle which is continuous in many marsupials is represented in 1ST LUMBAR VERTEBRA- ..^Sasan^^®" PSOAS. POSTCAVA TENDINOUS DIAPHRAGM MUSCULAR DIAPHRAGM STERNUM. _T^:^_ Fig. 233.—The human diaphragm viewed from above. Only the peripheral region of the diaphragm is muscular. The central portion is tendinous. The diaphragm is dome-shaped with the convex side uppermost. (Redrawn from Braus.) man by the serratus posterior, which is divided into superior and inferior moieties. When certain parts of the intercostal muscles contract, the rib-basket is raised, the thoracic cavity enlarged, and air is inspired to fill the space thus created. The levators of the ribs are twelve pairs of triangular muscles which connect the ribs with the transverse processes of the vertebrae and are used to raise the ribs. (Fig. 232) Diaphragm. The diaphragm is a dome-shaped muscle separating thoracic and abdominal cavities. The central portion is tendinous and only the outer portion which is attached to the ribs is muscular. When the muscles of the diaphragm contract, the dome is flattened and the. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P.
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